Questions. I Get Questions...

Here's a good one:

Okay Aesop, Here I sit, 76 Years of experience. With stock of N 95 & 99 masks, latex or poly gloves, a months worth of food and a reasonable supply of ammunition.
Things I NEED to know."
1, How long will the virus exist in open air, after some unfortunate has sneezed?
2, Will soap and water kill the little bastards? Showering after a trip to the drugstore? What if any soap or cleaning agent for normal people should be used?
3, Will local water supplies, (municipal, chlorinated etc) be reasonably free of the virus? If not, what will kill it? Boiling, salt, A few drops of Chlorox / gallon?
4, Any suggestions from someone that knows a hell of a lot more than me???

1) From seconds, up to 10 minutes. It's a parabolic curve.

2) Soap and water, per se, kills next to nothing, it removes things and washes them down the drain. Hot enough water may kill some, incidental to washing.
3) Normal washing suffices for cleaning clothes. You don't need to be surgically sterile. Most virucidal agents will sterilize things adequately, including weak bleach solutions, or commercial wipes, isopropyl alcohol, etc., for the few things (shoe soles, personal items) you might be worried about. Local water supplies, under normal operations, will be potable, and virus-free, as they're usually chlorinated and UV-exposed, etc.. Check with your muni supplier on their process if unsure.
4) At some point, stop leaving your house. You may not be given a choice about this by TPTB. That point will likely be long after the horse has left the barn.

Rule of Thumb: coughing among people is going to become the new Drunk In Public, with a side-order of Black Death, socially.
If someone is, expect them to be literally bum-rushed the hell out and away from people, possibly with some ardor and community violence. I mean that. Noses will get punched, and eyes will get blackened, until people catch on.

This will stop being funny when people start dying.
Then the torches and pitchforks come out.

5) Wash. Your. Hands.
Most epidemics happen because you touch an infected object (doorknob, shopping cart, etc.) and then touch your mouth, nose, eyes, etc., or shove food in your maw.
that's how you get the common cold. The flu. Gastroenteritis. Etc.
Stop doing that.
Wash. Your. Hands. Before you touch yourself or feed yourself.
Kids (under age 25, at which point common sense grows in) are the lion's share of this problem, which is how epidemics propagate from September until summer recess, and peak from Thanksgiving to Easter, and multiple generations gather inside cramped houses and share everything, including swapping spit, literally.

That eliminates about 97% of the problem.
The rest is being coughed/sneezed on by infected people.

If you're not out in that, you don't get it.
Period.

It isn't going to blow in your window and ass-rape you.
Easy-peasey.

And being 76, you're evidently at higher risk of serious complications from this thing, based on all available information.
70 and up seems to be where this thing starts really going to town on people, and it can get iffier for those in their 60s, especially with other co-morbidity conditions, like hypertension, diabetes, smoking issues, etc.