Aloe doesn't do well at all once you take it off the plant. I have about 5 of those giant types that get so big they tip over a 50 gallon planter, and I could probably start a side business with all the babies they put out.
Aloe will only keep for a week or so if you take the whole leaf and wrap in foil and store in the fridge. You can blend the gel into a smoothie. There are several recipes online. I made a creamy hand lotion by cubing the gel and blending with raw shea butter (you can use coconut oil too) until it looked like mayonnaise, and added a bit of crystaline vitamin c and vitamin e oil to preserve it. I keep it in a tupperware container in the refrigerator and use it within a few months. It's good for after gardening when your hands are dried out from dirt and clean up. Gift it to all your friends.
Mostly, I feed it to my rabbit.