By Alexis Rochester   I spend a lot of time washing hands, testing cleaning products and dealing with dry Texas air, especially this time of year.   As a chemist and busy mom, that combination can be tough on skin - hands, nails and feet - that seem to dry out no matter how much lotion you use.   Over the years, I’ve tested countless creams and trendy products to see what lives up to the hype.   Surprisingly, the best solution isn’t expensive or complicated. It’s one small bo