As long as the water is clean, the device will not be irreparably damaged. If something is allowed to soak in dirty water, however, with different particles and other mineral content, then the device will become damaged.
If you have a laptop that has gotten wet, the first thing to do is to turn it off immediately and remove all sources of power from it including the A/C adapter and batteries.
Set these aside while you take the laptop and turn it upside down. This will stop any more liquid from seeping further into the computer.
After you do that, use paper towels or a rag to mop up the liquid that was spilled, wipe the liquid off the keyboard and the outside. Also wipe down anything else electronic nearby that got wet, too, like an external CD-ROM or external hard drive.
Disassemble the laptop (take a look at your user's manual, too) and allow the insides to air out for at least a full day. Most people who have gone through this procedure recommend longer, especially if the liquid got further down into the computer.
The best thing to do is let it sit and dry until you are confident that the interior is completely moisture-free.
If the only liquid it came into contact with was water out of your faucet, then allowing it to dry should be all that is necessary, but if it was something like soda, tea, or coffee that was spilled onto it, then you will want to clean it with some rubbing alcohol.
You can use cotton swabs for this. Do not apply any heat to the device while you are cleaning it with alcohol and wait until the smell of alcohol is completely gone before you try to power it up.
Put the device back together after you are finished letting it dry or cleaning it up. Reattach the battery and see if it powers on.
If it does, wait and see if it starts up as it should. If it does not, then attach the A/C adapter and plug it up. If you can turn the device on after trying this, then all you should need is a new battery.
This should be pretty easy to obtain, as long as you have the money to purchase it with, either from the manufacturer or from a site like eBay.
