Like anything that involves natural ingredients, many syrups will spoil given enough time. The exact length depends on the ingredients used and the total amount of sugar, but most syrups in an airtight container in the fridge will keep for about one month. If your simple syrup is infused with fruit, it won't last as long-about two to three weeks in an airtight container in the fridge.
Agave syrup, which also has a fairly neutral profile, but with slight honey undertones, is a bartender favorite. Maple syrup, jam and honey syrup are other excellent options that add sweetness, but be mindful that they contribute additional flavors.
One notable variation is called rich simple syrup. It involves a 2:1 ratio of sugar to water. This means it's twice as sweet as a typical simple syrup. If you find yourself preferring a sweeter drink, this may be the way to go.
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