Help to prevent curl

My hair is like that


But i want the curl to stay straight to become like this


After showeing my hair is straight,but after a while,when my hair dries,it curls...Help!!
Things i cant use
-Hair straightner:(
-Only have a type of gel(hard hair gel)

Tell me if your help is permanent or temp hair.

THANKS:D

he used to get a spray or "sprinit" but since his hair is growing he uses a gel.  If you want your hair dry and straight then use a conditioner and natural hair loss product.