A large stainless steal drink bottle (36 oz or 1065 ml). Specifically a Yeti after doing careful research. Major improvements I've noticed: - not having to fr

A large stainless steal drink bottle (36 oz or 1065 ml). Specifically a Yeti after doing careful research. Major improvements I've noticed: - not having to frequently refill a small glass - not having to bother anyone for water when I visit - readily available for outings Thanks to the above, I'm well hydrated more of the time. The bottle is a bit bulky (it's insulated) but I'm happy with that tradeoff.