Quiz 3: Water & Caloric Sustainment

Roughly how much water can a person walking under load in heat need per day?

0.5 liter

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1 liter

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4–6 liters or more

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20 liters

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Why can’t you simply carry all the water you will need?

It freezes

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Water weighs ~2.2 lbs per liter, so multiple days of it exceeds a bag’s entire weight budget

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Filters are illegal

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It evaporates

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What is the central water truth of BSE 101?

Carry all your water

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You carry a starting supply plus the means to make more water safe — treatment is the enabling item

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Never drink surface water

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Boil everything

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What do hollow-fiber filters (LifeStraw, Sawyer) reliably remove?

Heavy metals and chemicals

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Bacteria and protozoa, but NOT dissolved chemicals or heavy metals

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Everything

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Only viruses

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What does boiling water accomplish?

Removes heavy metals

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Kills all biological pathogens, but does NOTHING for chemicals (and can concentrate them)

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Removes pesticides

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Adds minerals

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Which methods reliably address heavy metals and dissolved solids?

Hollow-fiber filters

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Boiling

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Reverse osmosis or distillation

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Chlorine tablets

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What is the water-treatment decision rule?

Always boil

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Match your treatment to your route’s contamination profile (biological vs. chemical)

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Always use a straw filter

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Carry no treatment

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On an urban/industrial route, why is a basic straw filter ‘false security’?

It clogs quickly

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It handles biological contamination but does nothing for the chemical/heavy-metal risk that dominates such routes

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It is too heavy

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It is too slow

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Approximately how many calories per day can active foot movement under load demand?

1,000

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2,000

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About 4,000 (up to ~6,000 in harsh winter)

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10,000

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What is the realistic approach to caloric needs on a multi-day movement?

Carry every calorie you’ll burn

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Minimize and manage a deficit with calorie-dense, no-cook food

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Don’t eat at all

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Eat only at the destination

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Quiz 3: Water & Caloric Sustainment

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