i use a tub of water for mine. after each feeding i simply put him in it and he would eventually go poop. After a couple of weeks he learned to go into the tub by himself and poop. so you could say he's 'water tub trained.' i then pour the water in the toilet and flush!

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Tristan
1.1 Blood Pythons (Rambo and Medussa)
1.2 Egyptian Uromastyx (Dog, Cleo, Slo Mo)
0.1 Suriname Red Tail Boas (Stoney)
1.0 Argentine Black and White Tegu (Roy)