Certain shampoos strip moisture from hair, and I don't see anyone pointing out that the shampoo may be part of the issue. Head and Shoulders is especially stripping of moisture, though there are many offenders.
I can recommend a few shampoo/conditioner sets that can help combat this dryness.
-Organix Moraccan Argon Oil (is a set)
-Really any Organix product (is a set)
-Three Minute Miracle Deep Conditioner by Aussie
-Loreal Everpure Conditioner
-Any shampoos or conditioners formulated for deep moisture or wavy/curly hair.
These can be purchased at any drugstore/pharmacy!
Using cold water can be less drying than hot water as well!
Hair Masks or Oils can be good to, but the true problem can probably be solved with any shampoo or conditioner listed above.