I've used a style that is... like a straw that sticks and makes that annoying noise when the animal uses it. I've never found one that doesn't leak. So far this is the answer. I lift it off the ground high enough that things like hay can't get in and I make sure it's in place and we're going to water land. Time will tell if it starts to go bad, but I don't see how it will. And for what, 12 dollars? Even though it lasts 3 months, I only buy it every 3 months because I said it doesn't expire?! lol.
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