Tonic water can be mixed with a variety of spirits including vodka and gin. It can also be used to create incredible cocktails. For example:
The Double Dream Cream-
In an un-iced rocks glass, build:
1.5 Ounces kahlua
1.5 Ounces vodka
1.5 Ounces schweppes tonic water
serve with a straw and drink from bottom up