I have several ideas, though all of the hinge on mission and spacecraft design

Mainly, since the vessel has a warp drive, we don't really have to care as much about the rocket equation. Meaning that bringing more elaborate equipment is justifiable. Furthermore I'm going to assume that thed setting has some near and far future technologies. Disregard options that do not fit your setting.

1. Do you want to eat canned food for a year? Can you imagine the effects that would have on morale? Yes? Good that this is an easy problem to solve. Try hydroponics and vat grown meat. Both are technologies that are rapidly maturing today and bringing a farming module on such a mission is quite justifiable. Maybe the rations were just the carbon component of the meals and now the hydrocarbons need to be expanded/repaired. Alternatively you could feed everyone out of a yeast and alge based agriculture. Aquaculture can also be done in some of the inner water tanks.

Just have the mission planners be a bit more creative about feeding everyone.

2. Build some sort of "farming". Let's assume that Tey have a lot of blueprints, really good design AI and decent, 3d printer based, manufacturing capabilities. Even if they don't have lab meat growing capabilities to bed in with, these highly skilled individuals (probability there is at least one biologist) and the vast databases of their vessel should be capable of setting such a system up. Then you would only need some blood and you can start growing meat. Farming labrats or alge used in the recycling systems you'd work as well.

3. Cannibalism, but we'll planned and organised. Amputations shouldn't be too hard in a property equipped medical bay. Calculate how much food (arms and legs) is needed to feed none or one or two people, depending on what's the minimum crew, for 6 months. Then cut of what you need, put everyone who's not required into an artifical coma to reduce food consumption and set up the medbays machines and the shops robots to feed the astronauts. They should all come home, all be it malnourished and a few limbs short.

4. If cryonics exists in your setting, they are a great option here. Even if they exist, there are good reasons for why they aren't standard procedure for space travel. Maybe there are religious or cultural biases against litteraly dying and beeing conserved in a state where reanimation of the frozen corpse (not wakeing up the sleeper, you are certifiably dead when in cryostasis) is possible. Or there is an significant failure rate, something like 20% don't come back and 40% have brain damage. If it is possible, construct freezers and medical equipment, mix up the antidepressants that will prevent brain damage and decapitate the crewmen going into cryostasis. You only need the brain with the head anyway. Might as well use the bodies to feed the guy who will fly the vessel back. The others might have to wait a hundred years longer, until unfreezing has become saver, but they'll live (again).

I have several ideas, though all of the hinge on mission and spacecraft design

Mainly, since the vessel has a warp drive, we don't really have to care as much about the rocket equation. Meaning that bringing more elaborate equipment is justifiable. Furthermore I'm going to assume that thed setting has some near and far future technologies. Disregard options that do not fit your setting.

1. Do you want to eat canned food for a year? Can you imagine the effects that would have on morale? Yes? Good that this is an easy problem to solve. Try hydroponics and vat grown meat. Both are technologies that are rapidly maturing today and bringing a farming module on such a mission is quite justifiable. Maybe the rations were just the carbon component of the meals and now the hydrocarbons need to be expanded/repaired. Alternatively you could feed everyone out of a yeast and alge based agriculture. Aquaculture can also be done in some of the inner water tanks.

Just have the mission planners be a bit more creative about feeding everyone.

2. Build some sort of "farming". Let's assume that Tey have a lot of blueprints, really good design AI and decent, 3d printer based, manufacturing capabilities. Even if they don't have lab meat growing capabilities to bed in with, these highly skilled individuals (probability there is at least one biologist) and the vast databases of their vessel should be capable of setting such a system up. Then you would only need some blood and you can start growing meat. Farming labrats or alge used in the recycling systems you'd work as well.

3. Cannibalism, but we'll planned and organised. Amputations shouldn't be too hard in a property equipped medical bay. Calculate how much food (arms and legs) is needed to feed none or one or two people, depending on what's the minimum crew, for 6 months. Then cut of what you need, put everyone who's not required into an artifical coma to reduce food consumption and set up the medbays machines and the shops robots to feed the astronauts. They should all come home, all be it malnourished and a few limbs short.

4. If cryonics exists in your setting, they are a great option here. Even if they exist, there are good reasons for why they aren't standard procedure for space travel. Maybe there are religious or cultural biases against litteraly dying and beeing conserved in a state where reanimation of the frozen corpse (not wakeing up the sleeper, you are certifiably dead when in cryostasis) is possible. Or there is an significant failure rate, something like 20% don't come back and 40% have brain damage. If it is possible, construct freezers and medical equipment, mix up the antidepressants that will prevent brain damage and decapitate the crewmen going into cryostasis. You only need the brain with the head anyway. Might as well use the bodies to feed the guy who will fly the vessel back. The others might have to wait a hundred years longer, until unfreezing has become saver, but they'll live (again).

5. Use the medical printer or synthetiser. If the technology is sufficiently advanced the medbay should have a way to grow replacement organs. Just programm that maschine to produce steak. Maybe one can even use the medicine synthetyser to produce something edibile.