I'm going to use my roommate's rice and tupperware to help my friend who got her phone wet
Why would you do that to his things? Will you use the rice and tupperware for your friend?
Yes, and she shouldn't be crying about it either.
It's normal to want to help a friend, but you shouldn't use other people's things without permission. Try asking them first and also offer to replace whatever you use. They'll appreciate you being respectful of their property.
That's not the point of helping. I just want to stuff it up his ass when he refuse to give permission.
I think it would be wiser still to just ask, politeness goes miles with people like roommates. While your friend would be thankful for your help, your roommates should be respected as well. How about just telling your gratitude even if he refuses?