Screens can be found in older style taps in homes and bathrooms. New homes have plastic, built in screens, but just check underneath your sink faucet, and if there is a metal screen under there, just pop it out with a screwdriver, or your keys or something.

If you have no clue what I'm saying or don't have screens, go to your local hardware store in the bathroom section, and look for sink faucet parts. They will have little packs of replacemtn creens for no more than $5.

Or a headshoip, but you have to be of age to buy screens from there. You could ask a buddy who is 18 or someoe who is of age to buy them for you if you want.