Same. I used to use and sometimes still miss a fancy thermos bottle, but I found it's just easier to use a new bottle every day and refill it two or three time

Same. I used to use and sometimes still miss a fancy thermos bottle, but I found it's just easier to use a new bottle every day and refill it two or three times than to worry about cleaning a thermos. I had the rather unpleasant experience of falsely believing a bottle that only contained water could go a few weeks without washing and then noticed black mold in it.