Water-based body moisturizers should be set on low to medium intensity to avoid over-hydration, which can lead to clogged pores and breakouts. Start with a dime-sized amount and apply it evenly over the skin, using gentle circular motions. Allow the moisturizer to soak in completely before applying any other products. For best results, use a water-based moisturizer after bathing or showering, when the skin is most receptive to hydration.