Shouldn't the fruit come from a post-Venosaur evolution that is triggered by beedrill or butterfree pollinating it?
Either way I'll go with the fruit. It's no more gross than eating chicken eggs. Meanwhile who knows where squirtle gets the water, it's probably sea water.
No, I'm pretty sure it's about consciousness rather than exact genetics. An alien cow wouldn't even be a eukaryote, cladistically, but they still couldn't drink moon milk. (I'm just vegetarian)