You can harness the force of a shallow stream. Picture this, i've never actually used it but its a pretty basic design that ive had in mind for awhile so here we go.
You have a stream thats maybe 1-3 feet deep with a decent flow, by putting a cinder block inside a 5 gallon or larger bucket with the opening faced towards the oncoming stream, with a hole in the other side of the bucket and a tight seal hooked up to irrigation tubing you basically have free water pressure right there. Now mind you, the size of the bucket, how much weight you need to hold it down solidly and how big your tubing is, is all dependent on the flow of the stream, take into consideration rainy seasons and drought if you have them.
Now that you have tubing with free water pressure, buy a battery operated water timer(should run you anywhere from 30 plus dollars depending on quality) buy an adapter for your irrigation tubing to a standard 1/2 inch hose size(if the tubing you have coming from the bucket is smaller) These timers can have multiple cycles and some of them have a rain delay which well hold off on watering if the timer senses that its been raining. Now that you have water pressure hooked up to an automated timer all you need to do now is buy more tubing and drip emitters and set the timer for how ever often.
Need to feed your plants? Buy a basic fertilizer syphon(most dilute at a 16:1 ratio) and hook it up right before your water supply into the timer. Premix your ferts in another bucket, have the siphon tube straw inside the bucket, this way every time your ladies get watered they can also get fed. I would put a lid ontop of your fert bucket though and drill a hole for the siphon tube, otherwise you may get debris that will eventually clog it up.Now instead of having to charge a battery to run a water pump, your harness the natural flow of the water and at most you gotta switch out the AA batts maybe once for the timer.
Tips: Camouflage! Everything!
