Will drinking sprite help with a sour stomach if ginger ale is not around?

Not really. Carbonated drinks like sprite or ginger ale don't necessarily help per say. Basically sprite or ginger ale would the same thing, since they are essentially made the same way. The only difference between them is the flavoring. For a better effect you could try TUMS, (calcium carbonate) Pepto Bismal or any other over the counter anti acid to help random heartburn.