During the rainy portion of the summer, I am quite casual about where and how I put out the water for the goats. So long as there is PLENTY of it (for days when the thunderstorms miss us), I don't worry about locations, because I expect the local wildlife to be able to drink out of puddles and the creek. I don't put sticks (aka "mouse ladders") in the water buckets because I don't expect anyone to try to drink out of them.
This morning, there was a mouse swimming for its life in the big boys' big water basin. I poured it out, and the mouse just sat there and shuddered. I don't think the mouse is going to survive the shock and exhaustion, but at least I gave it a chance.