You already do drink the crap that came from someone elses bowels! - it just flows out to sea, evaporates into clouds, rains down, runs across the ground (across some animal turd probably) into the dam with the dead fish and god knows what - then you drink it, after it has flowed to your house through pipes full of slime and rust and crud.....
Water is water, regardless of where it has lived.....
Don't they say every cup of water on earth today will have more than a few water molecules in it that were once inside Jesus Christs' bladder?