1. Sawyer Products SP128 Mini Water Filtration System, Single, Blue (Click Link to Check Price on Amazon)
Editor's Rating : 9.6 out of 10
Ideal for outdoor recreation, hiking, camping, scouting, domestic and international travel and emergency preparednessHigh performance filter fits in the palm of your hand

2. LifeStraw Personal Water Filter (Click Link to Check Price on Amazon)
Editor's Rating : 9.1 out of 10
Award-winning LifeStraw has been used by millions around the globe since 2005Removes minimum 99.9999% of waterborne bacteria (>LOG 6 reduction) and surpasses EPA standards for water filters

3. Etekcity Portable 1500L Emergency Camping Water Filter, 3-stage filtration , 0.01 Micron, Survival Kit Supplies (Click Link to Check Price on Amazon)
Editor's Rating : 9.7 out of 10
3 STAGE ADVANCED FILTRATION: includes pre-filter, 0.01 Microns antibacterial activated carbon filter and hollow fiber UF membrane inline filter eliminating 99.9999% of colibacillus, legionella, heavy metal ions, chlorine, volatile organic compounds (VOC), organic and insect contaminants

4. Katadyn Hiker Microfilter (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Insulates Freeze-dried meal pouchProtects hands from heat

5. Survivor Filter PRO-LE Upgraded 0.01 Micron Nanofiltration Water Purifier. Comes Assembled with Enhanced Internal Carbon and Ultra Filter Assembly, the Cleanable 100,000 Liter Ultra Filter Pre-Filter, (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
INDEPENDENTLY TESTED AT INTERTEK LABS IN THE USA: Tests show Removal of - 99.9% Virus, Staph and Bacteria and Reduction of Heavy Metals - 99.5% of Mercury and 93% Lead - surpassing EPA standards for water filters.SUPER FAST FLOW RATE AND FULLY COMPACT: Filters 17 ounces (500 ml) per minute, 6.5 inches (16.5 cm) long. Also includes Detailed Instruction Manual, Larger Tubing, Hose Clip, Zippered Carrying case, Attachable Cup, 100,000 Liter Ultra Filter Pre-Filter, Carbon Filter and 0.01 Micron Internal Ultra Filter.