Big friendly letters on the front that say "Don't Panic!"
I'd like some statistical info in a book, like shelter x in country y should take about z hours for a person to set up for the first time with just the following instructions.....
or shelter x requires y people to set up within an hour, and all will fit inside.
For time of construction, you would need to know exactly where in the country you are building (controls presence of materials), who is doing the building, what shape they are in, and how skilled they are. No formula can replace local knowedge and experience. Knowledge without experience is just information.
How's this: Unless you are very experienced, it will take much longer than you think. Start at once.
Water method x in area y has been tested to produce z liters of water per day average, greatest variable factor being c, other factors.....
Boiling produces almost the amount boiled, and the variables are size of pot, presence of tight-fitting lid, temperature of water, temperature of air, effective wind speed, time it takes to light stove/get a fire going, and heat produced by stove/fire. Other methods depend on other variables. Chlorine and iodine, for example, depend on temperature, dose, time of exposure to dose, ph of water, dissolved minerals, dissolved organics, and turbidity.
As for "area y," a couple of miles - or 50 feet, can make all the difference. You couldn't carry the book home, much less on a backpacker.
There are no simple answers for some issues, just a need for a good understanding of the problems and solutions, experience, and good judgment. If you could buy understanding, judgment, and experience, you'd be in a fictional existence.
Practice makes better.