How to make hose-spray connection with a kitchen or bathroom sink?

I live in a apartment. Near my kitchen is the parking lot for my car. I want to wash my cars.
I would like to use my kitchen sink, and hook it up to a hose, and use the hose to wash my car.
How can I achieve this?

If you take the aerator off of your kitchen faucet and take it to a good hardware store, they may be able to sell you a hose adapter. Hose adapters exist, but aerators are not always standard.

Note that you should also get a vacuum breaker - one that screws onto the hose fitting (this would prevent any possibility of backflow). You would also want to arrange things so that the hose is not putting undue stress on the kitchen faucet spout.

That said, getting a plumber to install a hose bib somewhere would be a better, albeit more expensive, way to do it.

You should get a plumber to cut the cold water line below your sink (and before the sink's cold water shutoff valve), and install a standard hose bib. (The main line to your apartment will need to be shut off while this work is being done.) Then, whenever you want to wash your car, you take the brush end of the hose outside to your car, come back inside and attach the hose to the bib under the sink, and turn the hose bib tap on. Be sure you get permission to have this work done from the apartment manager before you do it.

Assuming you have an aerator on your faucet, you can use an adapter such as this to connect the hose to your faucet:
http://www.amazon.com/Do-Faucet-Aerator-...
turn the aerator to remove it, then take it to your hardware store to match the threads. Screw the adapter into the aerator threads, attach a short remnant ( a couple of feet) of garden hose to the adapter, and attach your garden hose to the short hose remnant.
Don't chop into any supply line beneath the lavatory unless you want the implied responsibilty for water damage. Also, you would be cutting directly into either a hot line or a cold line. Coming off the faucet adapter allows you to mix the water to the desired temperature.

For this to work, the faucet must be the type that has a threaded, screw-on nozzle tip. This is more common in Kitchen faucets, to allow removal and cleaning of the filter screen. Remove the threaded tip and bring it to a plumbing supply house. There are many different thread sizes, so you need to bring the tip, to match the thread on your faucet. They will sell you an adapter to convert to garden hose. Be sure to use teflon tape when you screw on the new tip.

Just go to a plumbing store and ask for a adaptor to fit ur hose to ur kitchen faucet. Take off the nipple on ur kitchen faucet and use it to compare size to get the correct fit. Should only cost less than ($10) But if the owner see that it might charge u more for rent....lol