The "rice in a bag" trick only works if the water was just water, not something flavored, sugared or otherwise enhanced.
If it doesn't work, the repairs may cost more than you paid for it; logic board, keyboard, cabling, the optical drive, maybe the hard drive.
The only option you have at this point is homeowners'/renters' insurance. Many cases of accident computer damage have turned out to be covered, subject to whatever deductible you have. Put your insurance carrier on notice ASAP.
Theres no way to like, Hey I bought this yesterday and it isnt working?
Ethics, my friend, ethics. We have to take responsibility for our actions.
Plus you're asking in a forum sponsored by Apple.