Water is most often our survival priority as we can only last three days without it. So tasks 19 and 20 are basic and then more advanced about what you need.

Task Nineteen

Mild: Water Checklist

3 Gallons of water person.  Rotate every six months.

2 bottles of water in the car (preferably a case in trunk or back). Rotate every six months.

2 bottles of water in work/school GnG bag. Rotate every six months.

Task Twenty

Mod/Ex: Water Checklist

Moderate: 6 gallons of water per person; 4 cases

Moderate: Portable water filter

Katadyn Water Microfilter: https://amzn.to/2LBYcuE

Platypus Gravitywork High Capacity Water Filter: https://amzn.to/36N18Bi

Extreme: 30 gallons per person or more  (10 cases, 55 gallon drum, etc)

Mod/Ex: location of drinkable water source near home

Mod/Ex: GnG Bag: bottle of water purifying pills

Mod/Ex GnG bag:

LifeStraw Personal Water Filter: https://amzn.to/2V4uUJf

Mod/Ex: One case of water in car.

Extreme: BOHS—drinkable water source near hide site.

WATER! What You Need To Know About Water For Survival  #earthquake https://www.slideshare.net/CoolGus/water-for-survival-what-you-need-to-know-239013899 via @SlideShare #water #flood #hurricane #ClimateChange #LifeHack 
Water Slideshow

The Green Beret Pocket-Sized Survival Guide

Green Beret Preparation and Survival Guide.