There are ceramic pot dishes, the ones you put under plant pots, i think for 1$ at walmart, they are perfect size, you can get one now in a size that works, and upgrade it as the guys grows.

Yes, correct temps are the key. At these temps he is not able to digest food, that is why probably had impaction in a first place, but also you are looking in to a serious heath problems.

You can also do a honey bath for him, warm treated water with a few drops of honey, water level no higher then his chin, keep him in there fur 20 min, then follow bath (same water lavel) with 10:1 ratio treated water:unflavoured pedialyte.,keep for another 15-20 min and put him in a warm tank. Then give him some time to adjust to changed and try food.