Not sure if this is helpful.
We have several kinds of snakes living near our home, including garter. One lives in an old hollowed out tree stump. We do have multiple creeks nearby, but no standing water anywhere except some natural "bowls" that formed in trees and tree stumps which are pretty cool and seem to attract lizards. I haven't seen a snake drinking out of them, but I've seen shed snakeskins in the vicinity. I would say, it wouldn't hurt to add some shallow water sources.
I got lots of helpful comments on my post about a
micropond recently.