How do I change the laws of physics so water is less dense?

[YellowIsACoolColor]

It takes way too long to dry my hair and I need a fix. Thx

 

[AMHOLIO]

Stick head in oven

 

[Robert Cummings]

Just don't wash your hair.

 

[We Are The Witches]

You don't need to change the laws if the water is hotter, which technically achieves what you ask.

Or if you were hotter.