There's no such thing as a stupid question. I figure on getting some good quality hay and also feeding from the garden. Right now, I'm feeding pellets and with all of the GMO's running around these days, I don't doubt they'll mess rabbit food up too. So, I'll get my rabbits used to eating what's available a little at a time.
During the Great Depression, people used to cut weeds from the side of the road and ditches to feed to their rabbits. There are grasses with seedheads on them that are edible. Wild oats, wild rye, etc. Especially in areas that used to be large farmland tracts.
As long as your rabbits are getting a well-rounded diet they will stay healthy and gain weight. So, unless you are showing your rabbits, it isn't too critical. Root crops such as carrots, turnips and beets are good for them too and those crops can be grown and stashed for winter feeding.
Check out some historical documents. They didn't buy rabbit pellets because it didn't exist back then. Just like the laying crumbles that you buy today for chickens didn't exist back then. Ground up grain is quicker for them to digest than whole or cracked grain but they still lay eggs and still grow with home grown grains.