It is quite easy and inexpensive to make baby food. Use a blender to make the food the correct consistency and freeze leftovers in ice cube trays or flatten it in Ziplocs and break off what you need later. You can defrost baby food by putting it in a Ziploc or other waterproof container and soaking the container in hot water. You don't want to add hot water from the faucet to baby food because it might have a high concentration of lead in it. Don't save food that has saliva in it.
Saliva spoils food faster than normal because of the digestive juices.
It generally takes one month to get the coupons. They give the best coupons to newborns. If you overstock on formula and the baby can't use it. Return it to any supermarket for exchange as long as it isn't expired or sell on Ebay or give to women's homeless shelter. For Similac and their family of formula, go to Similac.