Tea-I drink my herbal teas ALL day. I Pop a teabag in the basket first thing & refill my bottle with boiling water over the same bag throughout the day. I purchased MANY of these as Christmas gifts this year, Everyone LOVES it. I switch between 3 bottles (outside design to fit mood of the day) & so far no issues ( a little rust in one basket, I kept it in use 24/7-now I air dry 11P-7A). DO Follow precautions on not putting boiling water into a VERY COLD bottle, the glass may shatter.