I've updated the instructions I have packaged with the pool shock in my kit with the aim that my wife or kids could use it in my absence:

Water Disinfection Instructions

NOTE: Disinfection will destroy harmful pathogens but will not remove chemical contamination.

A small quantity of water may be prepared more quickly by boiling. Any amount of boiling will do; it is not necessary to boil water for any length of time in order to destroy harmful pathogens.

1) Filter the water. If the water is cloudy or has any suspended particles in it, filter it to remove as much cloudiness/particles as possible. Use a shirt, handkerchief, filter mask, or other field-expedient means if you don’t have a purpose-made water filter. Alternatively, allow the water to stand undisturbed so that the particulate matter settles – this could be as long as 24 hours. Then draw the clear water from the top. If this isn’t possible, move on to the next step.

2) Make a stock of chlorine solution. Dissolve one heaping teaspoon (about ¾ ounce or 22ml) of calcium hypochlorite granules into two gallons (eight liters) of water. HANDLE CALCIUM HYPOCHLORITE WITH GLOVES ON AND IN A WELL VENTILATED AREA. DO NOT DRINK THE CHLORINE SOLUTION. DO NOT ALLOW THE CHLORINE SOLUTION TO SPLASH ON YOU OR YOUR CLOTHES. Store unused chlorine solution in a tightly closed container.

3) Add chlorine solution to water. Add one part of the chlorine solution to 100 parts clear water to be treated. For example, add 6.4 ounces (189ml) of chlorine solution for five gallons (640 ounces) of water. Double the amount of chlorine solution for cloudy or colored water.

4) Agitate. Loosen the cap of the container and shake vigorously, allowing chlorine solution to mix thoroughly with the water to be treated, and allowing the water to splash onto the threads of the container and the cap so that no untreated water comes into contact with people, clean containers or treated water.

5) Let it sit. Let the treated water sit for at least thirty minutes with the cap on before drinking. Increase contact time if the water is cold, cloudy, or has high pH (alkalinity). When in doubt, double the contact time.

6) Check for chlorine odor. The water should have a slight chlorine odor; if not, repeat the dosage and allow the water to stand for an additional fifteen minutes.

7) Aerate (optional). If the treated water has too strong a chlorine taste, aerate by allowing the water to stand exposed to air for a few hours, or by pouring it from one clean container to another several times.

8) Drink.