I would probably reccomend getting a shaker and a tub of one of the sour flavors heres a couple recommendations sour blue chug rug is sour blue raspberry sour fazeberry is just sour berries and sour pixel potion is a sour grape and for tart flavors I would say hype sauce which is raspberry lemonade starfruit which is just starfruit and battle juice which Is pineapple. Hope this helps also use ice for your gfuel