Tsh (aka Simple Mom) has an awesome hack that reduces the schlep factor for when you must feed the baby on the go:
I have to give total credit to my husband on this one. On more than one occasion, we've found ourselves out and about with no feeding instruments for our 9-month-old son. No spoon, no bib, no pureed food. One time, my hubby devised an emergency solution that we're now using almost any time we leave the house.
Throw a whole banana into your diaper bag before heading out the door. When it's time to eat, mash up the banana before peeling it – just squishing it a bit with your fingers does the trick. Then, peel open a small hole at the end (not the end with the longer stem) and squeeze the mashed banana into the baby's mouth like you're icing a cake. Voila – no spoon necessary, and almost no mess.
I don't advocate doing this at every meal, of course – the kid's eventually gotta learn to eat like a civilized member of society. But every now and then, when keeping a jar of baby food and all its necessary accessories is just too much, a simple banana does the trick.
Squeezable banana snack. It's like a banana Gogurt. WOW.
Related: Cut banana as portable baby food (this one requires a spoon but comes with its own "bowl")