Use a bale or 2 of hay as the base / table with everything else on top of or hidden around it - then you can point out the proportions of each type of food (eg by using a pair of soft toy bunnies and an appropriate amount of each type of food). Maybe set up a large dog crate for the bunnies with a daily ration, and clear shopping bags or wire shopping basket on the hay bale with a weekly amount - ie what you might expect to have to buy regularly to give an idea of the cost of keeping a pair of rabbits. The daily rations could be served imaginatively - grass in toilet roll tubes, novel / cheap hay racks, water bowl, branches of willow hanging up, pellets in an eggcup - anything that makes people look twice and think about it. It also gives subtle messages, such as bunnies don't like to live alone, hay is important, you don't need to feed a lot of dry packaged food.
Don't forget foraged greens (bramble leaves, dandelions, etc) and carrot tops rather than the orange root.