Reed's Ginger Beer is a not only delicious on a hot summer day, it makes a good a mule cocktail. It's sold in 3 different spice levels--Original, Extra, and Strongest, and all have good ginger kick. Fever Tree Ginger Beer is not too sweet with a deep, long-lasting ginger character.  Q Mixer ginger beer is another good option. They even added chili peppers to the mix and suggest it as a mixer only--not just as a drink. ** I tried Trader Joe’s ginger beer but imho it was too sweet and not fizzy enough to give a proper Mexican mule kick.