I do the same. A day or two after I return from a trip, I refill all of the bottles. I also keep an older curling iron in there, rather than throw it away.

Whenever I try a new hair product, if I like it, I add a new bottle or replace an old one.
_________________________
Follow our story of living, loving and laughing with a debilitating disease:

http://www.multiplesystematrophyandshy-drager.blogspot.com