He's awful skinny. You say he's two years old? Have you had him the whole time? It's possible old age is setting in and his body is beginning to shut down. Bettas, unfortunately, don't have very long lifespans. :(
For now, keep him in his small container with the AQ salt. It's 1 tsp per gallon and dissolve it with a bit of his bowl water before adding it in with him. When the stores are open (not sure if they'll be open on the 4th), try and get some Stress Coat and some New Life Spectrum Betta Formula pellets. They should have both at Petco. In the meantime, if you have any decaffeinated green tea, take one teabag and put it in his bowl. Leave it until the water changes color. This will release tannins that will stimulate healing. But the tea has to be decaf and it can't have any added flavors like lemon or things like that. Just plain decaf green tea.
I hope the little guy pulls through for you, he's very cute. Hang in there, okay?