Simple syrup is a very common ingredient that is used in place of sugar to sweeten many drinks such as the Daiquiri or Tom Collins. A homemade batch of simple syrup will last around 2 months if refrigerated, so an active boozehound will hardly have to worry about it going bad.
The recipe is, as you might guess, extremely simple. Start by measuring out equal parts water and sugar, a cup of each is usually a good amount. On the stovetop, bring the water to a simmer and then add the sugar, stirring occasionally. Once the sugar is completely dissolved, take it off the burner and let it cool to room temperature. Then you’re ready to bottle it and start mixing some tasty cocktails.