I make flavored simple syrups for my daughter to mix with seltzer so she can have "soda." She loves my cranberry version made with leftover sauce.
3/4 C. Water
3 Tbsp. Sugar
2 Tbsp. Cranberry sauce (I make it from scratch with orange juice and zest)
Heat all ingredients in a pot until the sugar is dissolved and just boiling. Turn off heat and cool. Pour into a glass jar. If you used a chuck sauce, strain it first. It will keep for 2 weeks. It can also be frozen for later use.