i get the tubs at dollar general for 2.50 and the ones at walmart are like 4 dollars and i like the dollar general ones better cause they have a lip on them that i can easily attach the water bottles to. and i have tried bowls for water before but the push poo and shavings into their water and it seems to be way to much trouble to keep them clean. i will post pics of our set up soon and it works so great.