T.H.
I made all my own purees too but I sure did buy me some Gerber cereal right off the shelf! ;) I think Gerber is fine but I know people who use Earth's Organic and like that too.
Also, just a note on carrying food with you....I put mine in ice cube trays and then plastic bags in the freezer so I had a variety of cubes on hand. If I was going out I usually just threw the frozen ones in a bowl with a lid and left the house. They were usually thawed by time I needed them or if I was going to someone's house I just threw them in the microwave. It's way easier than you think! If I was going someplace without a microwave I would sometimes pop them into my microwave just before I left for half the thaw time so they would start the process on their own. This way they were cold enough to be 'safe' and still be thawed when I needed them. I only used the jarred stuff when we traveled out of town for ease of use! If you're going to make your own stuff try and use it as much as possible, that was my motto! Good luck, either way your baby will be good!