My sunflower is getting kind of droopy..?

it's leaves seem weaker.... it's still green and standing but is there anyway to save it before it dies.... its only a few weeks... it got full sun and i watered it before going to work... i water it every day now since its hot... it was about 90 degrees out today...but the leaves seem droopy... is there anyway I can save it? is 90 degrees too hot?