

All of this has been solved in the last 5-10 years honestly. Thermoflask style bottles have gaskets that are easily removable and dishwasher safe. Brumate makes a strawed bottle that is magnetic, comes apart for cleaning, and is dishwasher safe. Yeti style have magnetic closers, are dishwasher safe, and easy to clean. Most of the really good ones are expensive but worth it.
Sit time doesn’t make a difference for my hair so it’s solely down to how much warm water I want and how tired I am (I’m an afternoon-evening showerer).