Most adults are mildly dehydrated for most of the day. The simplest fix: glass of water as first thing on waking, before coffee or food. Establishes hydration baseline that's easier to maintain through the day.
What this does
Replaces overnight dehydration. Slightly suppresses appetite. Improves cognitive function within minutes. Establishes a daily hydration anchor.
Glass on bedside table prepared the night before makes this automatic. Five seconds; meaningful effect on daily hydration.