Powered Water Filter/Distiller or Rain collection tanks.
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Rainwater collectors are really the only useful reliable water collection/storage for drinking and cooking, a powered filter/distiller or rain tank might be an good addition as the current way to store water is too small and collection is too infrequent. The unstackability of the glass bottle makes manual water boiling not feasable.
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etmoconThis already exists; empty bottles can collect dirty water from ponds and rivers which can be boiled.