Whatever brand of Diet that is on sale. Usually more than six a day. Concentrating on cutting back by instituting a One glass of water for every cup of coffee or soda.
My favorite is Pepsi made with the old formula. They used to market it as throwback Pepsi and now it is just listed as made with real sugar. I don't know why they ever went away from that recipe. And Mexican coke is better than what we get.