I mean with my question you could drink poison personally I would choose eat anything because I could just eat dirt and not have concequences but only under the scenario that it would rain often enough to drink water. I would choose drink anything because food like water is running low and only under the scenario that there's enough food source to last a long enough time.
That is a well thought out theory on the subject! it is true that water is not as common, even though there are ice caps and also you can make water by the combination of Hydrogen and Oxygen, the process would take a long time to provide enough for a world if it went dry.if you think about it as well, almost everything requires water to survive if you go through the food chain, ALMOST that is, the majority require it.
Plants need water, herbivores need plants, carnivores need herbivores and omnivores need both and fungus need dead things
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