" All the advice on the internet" ??
You have honestly looked at ALL the advice on the Internet, and all of it is to not leave water in their crates?
I don't think I am allowed to accuse you of lying on Mumsnet
@Canyouanswermyquestion
but guess what, I am anyway. Because no-one can have looked at all the advice on the Internet about it, except maybe someone doing a thesis, who can spend months looking in obscure places for such information! And, even if all the advice did say to leave a dog of any age, locked in a crate all night without water, that advice would be WRONG. I would stake my life on that - I am not exaggerating here - it is a hill that I am willing to die on.
I cannot stand the thought of any animal suffering, but particularly dogs. They have spent thousands of years giving us unconditional love and loyalty, and to repay that by making them suffer, just so that we don't have to get out of bed at night, or just so that we don't come home to chewed furniture etc, breaks my heart.
If you can't dedicate time, effort, and your own uncomfortability (at times) to your dog, then don't have them. It is also probably a good idea not to have babies either, as they are much harder work, and for much longer.
By the way, in the above paragraph the "you" wasn't directed at any one person, it was for everyone who fits that particular bill.