Personal anecdote. Experiences vary but for me over the past few years deliberately drinking a lot of water- generally 64oz+ per day, lightly salted (a couple of coarse grains per 32oz jug)- has had a huge positive impact.

I almost never feel thirsty when I don't drink and so have to put in conscious effort to do it but when I do many aspects of my psychic experience change. I am more awake, think more clearly, have more energy, on and on. Many more purely physical aspects improve as well- my digestion is better, I have better appetite management, my skin is clearer, etc.

Last year we had a temporary issue with our fridge ice maker so I used that as an excuse to get the family a super bougie standalone ice maker- the GE Opal. It has unexpectedly made the water habit much easier for everyone. Now I can't think of a better spent $600.

Really would like Huberman to do a hydration/water/salt episode.