Normal household bleach can be used to kill germs in water. Bleach will not
kill tuberculosis germs however. Regular household bleach is a solution of
5.25% sodium hypochlorite. It should be JUST bleach, no extra whiteners and
brighteners.  Many bleachs state "not fit for human consumption", if they 
conatin ONLY hypochlorite, they are suitable for water sterilization.  You add 
1/2 tsp to 5 gallons of water if it is clear, 1 tsp if the water is cloudy 
(hint: stock up on commercial sized coffee filters at Sam's). Allow to sit at 
least 30 minutes, be sure to splash treated water on lid, spout, funnel etc.

P.S. the chlorine gas will bleed through most plastic bottles, so over time 
your chlorine concentration goes down (hint: add more if the bleach is old or 
has been stored in a warm place)

You can make your own bleach by purchasing swimming pool "burn out" or
"shock treatment". It must be ONLY 65% calcium hypochlorite, no addtional
anti-fungals or clarifiers. In an EXTREMELY well ventilated area, (Hint:
OUTSIDE!) add 24.5 grams (about 10 Tablespoons) of powder to one gallon of
water for a 5.25% solution. Five pounds of dry pool bleach costs about
$10-15, which will make about 92 gallons of bleach, which will sterilize
706,560 gallons of clear water, or 353,280 gallons of cloudy water.
If you allocate 3 gallons per person per day for drinking, food preparation, 
and sanitation, $15 will take care of 100 people for one year.