You are going to use it so little that it is not worth investing in an expensive pump or setup. The following is a minimum.
Get a 1/2 HP plastic-body jet pump (which will include a pressure switch); a couple of lengths of PVC pipe and fittings that fit the pump, a foot valve to go in the cistern, and a modest pressure tank. Connect the pump to an outside faucet; and plug it into a convenient outlet.
You can run 1" PVC to the outside faucet. That is larger than you need but I like the fact that it is more rugged than 3/4". If there are code issues you can use CPVC but most people would not use it as long as it isn't going to flood a living area if the pipe breaks.
The pump will run when you use water and will shut off when you stop.