My hair has always been dry. I dilute shampoo in water so it will not damage my hair. Whenever people would try to ask me for shampoo, I end up getting cussed at because my bottle has bubbly water.
I use L’Oreal Elséve Damage Care Repairing Shampoo, L’Oreal Elséve Smooth Intense Daily Rinse Out Treatment and L’Oreal Elséve Re-Nutritive Conditioner. Initially, the habit was, I shampoo every other day. The days I do not use the shampoo, I just use the Daily Treatment with the conditioner. Later, I realized, I should ditch the shampoo altogether and just use the conditioner, any 
conditioner.
Now I am using an old bottle of V05 conditioner I found laying around the bathroom. So far so good. I know most of you think it is gross, it used to gross me out that is why it took a while for me to try it out. Having dry hair is a nightmare.