Personal Water Decon Kit

Water treatment and first-line meds sized to throw in a chest-rig pouch, a glovebox, or a pocket. 10 purification tablets, 6 anti-diarrheal packets, 2 antibiotic ointment packets, 4 towelettes, 4 alcohol wipes, and 4 bandages, in a 4-mil laminated mylar resealable bag with a waterproof fire-starting instruction card. 1.2 oz all in.

It's an individual kit. It covers one person for a short window, not a family for a week, and the tablets disinfect rather than filter, so pre-filter cloudy water first.