One of the things the DW and I do when it comes to food is to take what we already have in the freezer and pantry and just get a few things that we may need. We figure it was food that we were going to use at home anyway but instead will just use on our trips. We like to camp at SPs instead of private campgrounds. State parks are cheaper than the private CGs that are in it for a profit. Depending on what you want to do once you get to the CG will determine how much $ you'll spend. If you're just going to take advantage of what the CG has to offer you will get off cheaper than if you go on excursions, theme parks etc. Cost will be solely up to your family based on what you all want to do. Whatever you decide, remember you're making memories for your entire family that will last a life time.