Hair is a lil dry after swimming!

So since I went swimming on saturday. My hair has been feeling dry. I am not sure if its the water here (hard water here) or I need to keep moisture in my hair. I dont know why its feeling like this. but for the past few days Ive been cowashing, hoping that this would help moisturize my hair. last night I left the DC in my hair all night. But hair still feels a little dry. Well I'm going to continue to cowash and DC til its soft again.