I always add these to my water, even my water I bring to the gym, when I get myself there. Lime is my favorite.
Please note...these can be tough to find at the grocery store. I usually find them in the baking aisle or near Jell-o. I have also seen them with the tea and coffee. Maybe because these can be used in recipes and flavorings. But if you go in the aisle with beverages and you see the countless other packets that artificially flavored and sweetened and you do not see these, do not despair, check the baking aisle, tea/coffee, or ask someone who works at the store.