(Wrote this last night but gremlins wouldn't let me post so here goes now...)
Feel free to roll your eyes and say "I know that" but if you want to be dairy free, that lactose free milk is not what you need. It is lactose free but still dairy. (And I say that as someone who was lactose intolerant but then had to give up all dairy, no fun!) If you are going dairy free then you need a dairy free milk like coconut, soy, almond milk, something like that. There are good soy and coconut based yoghurts out there and also good soy ice cream
If the lactose free is ok, then look out for lactose free cheeses. They exist in the UK, but maybe not in Florida. I'd take a trip to a good health food store if you can.
Otherwise, you want to be thinking about eating good fats and protein. Eggs. Avocados are great, and personally I ate tons of nut butters for bfing, peanut butter is a personal favourite but almond butter is yummy too. Fresh carrots, cucumbers and hummus make a great snack. All those nut butters and hummus are good sources of calcium. You could also add some tofu into your diet, the smoked stuff is very tasty.