The bare mininum intake of water should be at least 64 oz. Now if you live in hotter states like me who live in AZ in the summer months you will want to increase that intake to about 96-128 oz per day. Of course your activity level and how much you spend outside will be a factor as well.
Neanderthals were a separate species from modern humans, and became extinct (because of climate change or interaction with modern humans) and were replaced by modern humans moving into their habitat between 45,000 and 40,000 years ago.
Homo neaderthalensis lived in Western Asia and Europe at the same time as Homo sapiens. The morphology and brain size of Neanderthals is comparable with modern humans, but certain features of Neanderthal anatomy, such as a large nose and a robust skeleton, may be adaptations to Ice Age climates. Unlike modern humans, Neanderthals have an occipital bun. Neanderthal burials show evidence of cultural treatment of the dead. H. neanderthalensis was replaced by successive radiations of H. sapiens into Europe. Recent studies suggests that the two species were able to successfully interbreed. The type specimen for H. neanderthalensis is Neanderthal 1 from the Neander Valley in Germany.