Sprite does work for me to settle my stomach when I have the stomach flu.
Teas also can help with the stomach flu such as Chamomile and Peppermint Tea.
Sip on the sprite or the Tea and try eating some Chicken Noodle Soup which works for me when I have the stomach flu as it's easier for my stomach to digest and doesn't come back up like other foods.
Just stay away from dairy products when you have the stomach flu and you'll be fine.
The stomach flu should go away within a 4 to 7 days.