The best thing you can do is eat vegetables with a high water content which have been shown to be more hydrating that water itself.
Don't forget your oily fish, nuts and avocadoes.
Avoid all processed food, especially high salt foods like bacon, and all foods high in sugar.
Exfoliate regularly with table salt and lime juice (cheaper and better than any "beauty" product and won't harm the environment) and apply a honey mask twice weekly (set honey straight from the jar).