My LO is 6.5 mo and we've started him on solids. We're doing purees for a while and then going to try BLS. I've been making my own purees but am curious about using them out and about. So far we've only been feeding purees at dinner because we're generally home for dinner. If I want to give him purees while out what's the best way to transport them? We would only be out for a few hours at a time - probably leaving home around 9:00 and returning in time for nap around 1:00 in the afternoon. Can I just pop a frozen cube of food into a container and feed it for lunch or do I need to put the food in a cooler bag to keep it cold?