Simplest cheap method is to use a pond pump, which is submersible, reasonably quiet and which even is available in 12VDC versions. This feeds up to the manifold on the top, and your water valves are connected to this. The manifold is a larger diameter pipe, and at the far end you put a pressure regulator to keep a constant pressure. Valves will need to be small, and have a nozzle on the end to get the flow, but also need to have a minimal volume ( but they do not need a high flow rate) and need to be direct acting.
You can get away for a short term project using pneumatic valves, as they will survive water for a while, though they will corrode.