@jean100 We too. Also we don't bother with warming the water, unless it's a blowout size type of poo (but then we more or less dunk his lower half into the wash basin, filled with warm water)
But I'd say a thermos with warm water would Work?
@prophoss Hmmm I had to look at a bottle to see how much 5 oz is 😂 my 10 months old drinks 6 oz at most (before starting solids, even less).
And he's content with a low flow nipple
@aliemikeyj Even the hospital (German) didn't have RTF, they mixed it from powder. There was a designated "Milk Kitchen" next to the Newborn Unit/ NICU where obv somebody mixed all the needed formula for the day every morning...