I love hosting pool parties, but it's expensive. 1 rule keeps me from going broke over summer.

The author is happy to host others at her pool, but she says always asks them to bring snacks to share. Catherine Falls Commercial/Getty Images Owning a pool can be quite expensive, but I'm glad we can host our friends. I've realized that the pool is the draw; I don't need to handle everything for our guests. When friends come for a swim, I ask them to bring a snack to share. It keeps costs down for me. Seven years ago, we finally made our family's dream of having a pool in our backyard com...