Well, uncooked rice is good, its an easy alternative. Whats even better is silica gel. Its not easily available unless you're working in chemistry lab or have friends that do. For silica gel, you can heat up the silica gel first, let it cool and put your phone inside the silica gel and let it be for 2 hours, even better if you remove the simcard and memory card tray so that the moisture can secape from inside the phone. You can try opening the back cover, only if you know how. Actually you need to open (I cant explain it here) the bottom rounded cover, then slide down the back cover then gently pull it out. For silica gel, a few hours should be enough. Longer is better. For uncooked rice, I would suggest a few days.Longer would be better.
Its really best to remove the battery of a phone, but in our phone case, its a bit difficult unless you know how to. At least you can put some insulator between the power contact between the battery and the phone.