This cocktail saving tip came to me one night when I needed just a bit of simple syrup for one more drink.
1/2 cup water
4 TBL sugar
Put sugar and water in a coffee mug or other microwave safe cup and nuke on high for 1 minute. Stir. Sugar should be dissolved, if not microwave longer. Simple syrup is used in many different cocktails and is a life saver if you are running out of juice, tonic, or soda as you can make a pretty decent drink with one part liquor, one part simple syrup and two parts water. And I'm pretty sure that if you get to the point in the night when you are making microwave simple syrup, you won't care too much what the drink tastes like.