Watching my large groups of snakes has shown me the importance water plays in their lives. My garters drink a lot of water. I try very hard to change all water dishes everyday. Yes, I'm guilty of letting a few of them go an extra day if they have not been used as a toilet but never any longer than that. I know that they can go a long time without drinking and I know that they will drink from any source of water in the wild. Much of this water unfit for human consumption.
Many of my snakes come out and gather around the water dish when I fill them. I think they are hoping there will be some fish in all that splashing.
I guess the reason for this thread was to stress the importance water plays in their lives.
Since they are in our care, it should be the importance of available, clean, fresh water.