Find a spring close to your home. These are often located in or near forests and mountains and outside freshwater lakes. Find a spring that is no further than an hour's drive from your home, or your water may become stale and warm during your trip back home.
Put the top end of the hand pump inside the spring.
Push down on the pump to force all the air out, and extract water into the dispensing tube.
Push down the pump five times to flush out debris that may have gathered inside the pump.
Take a glass jar and place it on the ground next to the spring. Feed the dispensing tube into the jar's opening.
Press down on the hand pump to fill the jar. Allow the water to rise to an inch from the top.
Screw the cap on the jar tightly. Put it aside. Repeat this process until all your jars are filled.
Wrap each jar in a blanket or towel so they will not break on your journey home. Place them all inside a large box and put them in your car.
At home, keep the jars in a dark place such as your basement at a cool temperature. Keep them wrapped to prevent damage and increase shelf life. The water will stay fresh as long as you keep it out of direct sunlight.