Live worms. (I strongly advise against using this type of food). Brown worms, blood worms, any worms your fish store will sell you, any cultures that will produce live worms, in short bettas LOVE worms. And in this case, you should be able to easily find live worms at your local fish store. I do NOT recommend picking worms from gardens, etc.. As they may have been subjected to pesticides etc… When you feed live worms to your betta, FIRST CLEAN THE WORMS THOROUGHLY. Worms can carry tones of bacteria and parasites.