A little water spilled on my macbook

Ok i know, really stupid to be drinking near the macbook but what's happened has happened and nothing i can do now. Anyway, it wasn't a major amount and it landed mainly on the top of the keypad and screen. I turned it off immediately and mopped up what water there was with a towel. I know since i should have left it off but worry overcame me and i powered it up again to see if it was ok. Everything seemed fine. Powered on ok and most of the keys worked ok.

But, the numbers and the top two rows of letters did not work when pressed alone. They work when pressed with the key next to them if that makes sense but not alone. Anyway i switched it off again and that's how it's stayed since (this was about 3pm GMT).

I'm planning on leaving it overnight and checking it in the morning but should i leave it longer? Its laid on its side at the moment in a plastic bag on top of rice next to a radiator. Is that ok? And it was only plain water. Anyone else suffered a similar problem and if so did it work again after letting it dry out? Like i said, the other keys work just not those three rows.