Measure out 2 cups of granulated white sugar using a measuring cup, and 2 cups of water using a liquid measuring cup.
Add both water and sugar to a pot over medium heat and stir using a wire whisk.
At first, the liquid will be cloudy and viscous (thicker than water) until the sugar that has sunk to the bottom of the pan has dissolved.
Continue stirring fairly regularly. You'll begin to see little bubbles forming on the bottom of the pan.
When the liquid changes from cloudy to clear, you'll know that the sugar has fully dissolved. Remove the syrup from heat.
Grab a funnel and a glass bottle or jar (I love this one from Amazon). Carefully pour your syrup back into your liquid measuring cup, if it has a spout, to make it easier to pour directly into the jar. Make sure to keep the top open until the liquid cools. Simple Syrup should be stored in the refrigerator and will easily last several weeks.