Tonic is a classic mixer, yet despite its ubiquity, there's a still a lot that can be done with it, as this trio of options from Jack Rudy Cocktail Co. proves. The handcrafted Classic Tonic Syrup is made for maximum versatility, and is joined in the package by a bright Elderflower Tonic that goes well with tequila and dark spirits, and an Extra Bitter Tonic that mixes best with Juniper-forward gins. An excellent gift or an addition to your own home bar, the set includes three 8-ounce bottles.