What is the height difference between the "reservoir" and where you want the water? How much water do you want to pump? How often?
If either number is large, you're going to be one tired puppy.

(or the kids will be, or...)
There are plenty of options, like
these. Do you have a tractor, truck, riding mower? You could get a tank wagon, and gravity feed the water into it. You would need at least 4 feet of drop to fill the tank. Once filled, drive it to the garden.
No electricity? Do you mean none, or just not AC? Can you drive a tractor/car/truck/anything with a battery near the water? 12v pumps works fairly well. For that matter, if you just use an inverter, you could get away with
an AC pump connected to the battery.
If you want to stick with just human powered, you
can pedal your way to greener plants. Another option is the
treadle powered pump.
Lots of options, so we need to know more about what you want.
Michael
Edit:
This is just too cool. Make it yourself.