I bought a Soda Club carbonator and now I can have sparkling water whenever I want. With a squeeze of lemon, it makes water festive and although there is an upfront investment, it pays off in the long run. They also have diet soda flavors so you can make your own pop - or light tonic water.
Not only can you save money by checking out books, but your library may have passes for museums that you can check out. Mine does! Not only do I save on library admissions, but I am more likely to go.