I have been a hair designer and product development consultant for 35 years.
All hair products are basically the same and they are all water soluble. You can't control moisture with water solubility. Moisture only comes from your shower head not hair products. The key is to lock moisture in and all hair products are water soluble and break down after 2 to 3 hours after application. There is only one products that locks in essential moisture and protects your hair from shampoo to shampoo.
Not a sales pitch ... it's fact.
Try Aveeno Nourish+Moisture shampoo and conditioner. You will seriously love it!
I believe thats what conditioners for.
Try rose water mixed with glycerin
Extreme...but would solve the problem ;)