Thing with drinking TOOOO much water, and it can vary person to person, is you need to make sure your electrolytes are in good shape. I knew an elderly (early 80s) husband and wife who reduced their salt intake in order to prevent hypertension (which they didn't have). They increased water intake at the same time. This was a collaborative health and wellness attempt unbeknownst to their doctor. They both had mini-strokes on the same day and ended up in hospital for a few days.
