A lot of people on the Swiss Army Knife fan site I go to ( www.sosakonline.com ), me included, have their favorite SAK or another one they like to have as an EDC. Then they clip the things they want on a carabiner which is more than likely connected to the SAK's keyring.

For example, this dude has a small Classic model with a mini-Sharpie, a pill container full of cotton balls for tinder, and a Photon...
Pic

My configuration has a locking-blade SAK, Photon, Fox 40 whistle, ferro rod with striker, a lanyard, and a skull keychain for looks. I usually carry all kinds of junk but I have just this on me today, which I consider minimum, non-emergency, good-anywhere carry. Is this what you had in mind?

As for water, when you say "non-emergency" I automatically assume the nearest drinking fountain, garden hose spigot, or kitchen faucet, and that the water is still on/potable in the first place. Just drink and go, with maybe a Ziploc baggie or a Platypus bottle (I have one but I have to hunt for it, it may not be good anymore) if you needed to transport the H2O...

Well, as with my PNW youth experience, I would hope that you would normally EDC some sort of rain gear or such. Since part of my EDC back then included footwear, a coat, and a hat or umbrella that kept me more or less dry while walking to/from school, work, or a friend's house. In that respect, a 72 hour kit would at best minimally augment what I would already be carrying, so hopefully I wouldn't feel the need to pack another rainsuit with me all the time. I guess it depends on you MO at the time. Mine always had me outdoors and in it, so trying to keep from getting waterlogged was a common effort.

I also vote for one of the cheap plastic ponchos.

And Ginger. I always vote for Ginger (there's something about redheads...)

-Blast, after maybe a little too much Maker's Mark.

Ginger? Come on now. Inetlligence, grace, smoking hot, Mrs. Howell had it all!

It was the mole, wasn't it Blast?

No, a little lower...

-Blast

Well, Ginger was definitely some good eye candy, but did you ever see how Mary Ann can peel a potato. Oh man!!!

Man,
It didn't take long (or much) to hijack this thread!

(and there definitely was "something" about Mary Anne)

Agreed, With addition of water, food and some insulation ( blanket/ jacket) most edc can become a 72 hour kit.

(I'm with Blast on Ginger... Gotta love a redhead)

The suggestion about the camelback was good. Works as a mean of carrying other things without being too large itself (depends on the model you get). Can carry enough water to hopefully get you to the next refill point.