Tonym,
If your friend's tank is cycled there shouldn't be any ammonia in the water. You can "clone" another tank by using some of the substrate or some filter media from a cycled tank. The beneficial bacteria live on the surfaces in a tank.
If you can get some substrate it can be suspended in a nylon for a week or two while the fish is in the tank. You will need the fish in the tank so there is ammonia produced to feed the bacteria that you introduce when you clone a tank. You will need a freshwater master test kit to check the ammonia, nitrite, nitrate and ph. You will also need to make frequent water changes during this time with dechlorinated water the same temperature as the water of your tank.
There are no quick easy ways to cycle a tank, you will either need to do a fishless cycle, clone the tank with bacteria from an established tank, or cycle with fish (very hard on the fish).
I have cloned all my tanks, it is quicker than the other methods of cycling the tank. It still requires dilligence, frequent water changes, and testing the water at least once a day.
Taking short cuts will result in poorer water quality and increase the chance of disease in the tank. Patience and dilligence will pay off with healthy fish and fewer problems.
Bryan