I always just gave room temp when I was out. It was breast milk though, most of the time I just nursed but sometimes I brought a bottle. We have a bottle warmer and I've never even taken it out of the box.
<blockquote><b>Quoting ♥ Ashley + 2:</b>" <blockquote><b>Quoting ChristinaLynne:</b>" Stick a pack of bottled water in your trunk. ... [snip!] ... I'm going to stick some in the car the day before.. I guess I didn't think about them bring warm lol"</blockquote>
We can thank my husband who gave me the idea when he was complaining about hot bottled water in Iraq.