If you have magic, presumably reasonably powerful mages could inscribe runes of repulsion, that push living things away from them?
Have a spacious cell with these runes inscribed on all six walls pointing inward. Toss in the offending TK, and they instantly get pushed to the middle of the room. With a little practice and a large enough room, they could probably still have some mobility (think "swimming" like astronauts... inefficient, but it's something).
If the runes only target living matter, then guards can come through a door in the corner and toss food to the prisoner, and the prisoner can drop the remnants (bones, seeds, etc, all of which should be too impure for them to use practically anyways) which the guards can sweep up later using a broom on a long pole.
For bathroom business, you can perhaps have the floor sloped downward toward a drain (if the drain would break the floor's rune, you might need multiple smaller runes placed around the drain instead). Then the prisoner just has to orient themselves so their waste goes downward (and not all over themselves), and guards could hose any remainder away.
If you want to give the prisoner a means by which to anchor/orient themselves, you could have chains attached to the walls, inscribed with powerful shock runes. A thin mixed-fiber rope (cotton, wool, and whatever other non-leather materials are available) would be tied between the two chains so the prisoner could use the rope to orient/move themselves more efficiently, but can't reach the wall (the chains should be at least six feet from wall to rope... between the shock runes on the chains and the repulsion effect of the runes getting stronger as they get closer, it will be impossible for them to touch the wall without getting blasted). Of course the rope could still present a security risk in the hands of a powerful-enough, motivated-enough, and clever-enough telekinetic...
Prisoner garb should also consist of this same mixed fabric (whether the rope/chain idea is implemented or not), and guards should ONLY be allowed to wear leather and metal, so their clothes can't be manipulated.
Perhaps as a last ditch security protocol, distilled spirits could be stored in large reservoirs above the prison (and amply insulated, vented, and periodically resupplied). Each cell would have a control valve and several tiny nozzles in the corner of the room -- pulling the valve would activate small shock runes to make an arc near the nozzles, as streams of alcohol come spraying out... boom, flambéed TK. If you want to make sure bored/miscreant guards don't do this for "fun", maybe the valve handles are out of reach on the ceiling, and made of pure iron, and a small number supervisory TK guards have iron rods at their hip so they can activate the valves. If the only TK guards were these few privileged supervisory ones, there would be easier accountability for "accidents".