What % of brain is water? 77 to 78.
The idea that tap water is yucky … is not necessarily correct. Using filtration may or may not be good, depending on what the filter is made of. If it is ion exchanger it may be harmful to some.
Turning electronics “on” certainly entangles your brain.
Doing a brief exercise is good but excessive can drain you and spoil your day.
A review of day schedule in the morning and before going to sleep is always great idea. This keeps you focus.