Most of the time, your goal would be to NOT have the tank cycle. If you had lots of time, cycling would be a good idea. If you are only using the tank occasionally there will not be enough bacteria in the tank water to handle a large amount of fish waste.
To prevent a tank from cycling (i.e. having an ammonia or nitrite spike to stimulate beneficial bacterial growth), frequent water changes are essential. In addition the tank should be lightly stocked (no more then 1 inch of fish for every 5 gallons). The fish should also be fed little (to decrease formation of wastes). I have little experience with water conditioners but they could probably be used if you do experience detectable ammonia or nitrites. (Obviously you will need to check the water frequently).