just follow the FAQ suggestions which have been posted here thousands of times.
Copper and zinc do not rust (they do oxidize, though). But the moisture and the electrical will zap a device if the moisture is still in the device.
on top of that, you dropped it in a margarita? the sugars in the drink will get gummy on the board and keyboard and not help out any... if you will have problems after the drying period, use isopropyl alcohol to wash the contacts on the keyboard with the device disassembled.
Got Your BlackBerry Wet? - BlackBerryFAQ