How to feed 6 month old baby with homemade solids outside? for instance with rice&banana/apple? how to save food fresh for 4/5 hours outside?

Bananas: Bananas are to easiest solid food to use outside. Keep a ripe banana in the peel until time for eating. Use the back of a spoon to mash the banana and voila you have a solid food snack. Other homemade solids need to be kept refrigerated on ice while not serving.

Keeping food fresh : Do you mean how to keep food fresh ? Use ice or cooler mates and store in a cooler.