Depends, Prevails, Covidens, Tena, and many others are sized by S, M, L, XL and various absorbency are available. You may have to experiment with an assortment. Definitely NOT cloth, whooooeeeeee!
There is a company called Cheap Chux. I have ordered from them for years now and they are wonderful. You might give them a call and they can send out some samples to try. I know there are liners available to help with poo as I have used them also. Hope this helps.