take a small bottle of bleach it will last you the whole trip.
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1 teaspoon Ultra CLOROX bleach per 5 gallons water
16 drops Ultra CLOROX bleach per 1 gallon water
4 drops Ultra CLOROX bleach per 1 quart water
Wait 30 minutes. The water should have a slight chlorine odor. If not, repeat dose and wait 15 minutes, then sniff again.
Use only Ultra CLOROX bleach, not a scented bleach.
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BLEACH
For instant conversion of metric to Imperial standards
http://www.wooddesign.bc.ca/convert.htm
1 US Gallons = 3.78500 Liters 1 US Liquid Quarts = 0.94640 Liters 1 US Dry Quarts = 1.10100 Liters 16 Fluid Ounces = 0.47312 Liters
Note: Use only brands of bleach which contain Sodium Hypochlorite at 5.25%
Do not use lemon fresh or fresh scent types of bleach or any bleach with ingredients which consist of anything plus the sodium hypochlorite.
Do not use Hydrogen Peroxide type bleaches. There is a lack of consistency which could put your health at risk.
REMEMBER: chlorine is a toxic.. Too much and it can kill you. So be careful with both bleach and chlorine tablets. Use recommended doses only.