I eat a lot more fish....usually daily.  I'll also eat a desert such as pudding in the evening which I normally don't do at home.  Same with granola bars and gorp.
They say fish is brain food but I don't seem any smarter when I get back .  Just ask my wife and she'll tell you.

Crystal Light
Crystal Light and 151 run (or 180 proof brandy) and lake water
Powdered soup
Replace watching TV with watching the campfire

On trips its 100 proof wild turkey, with some of the finest lake water in the world and a smidgen of tang. The tang is a tradition that started before my tripping days began, and is aptly referred to by dad as a "Quetico sour". Would not be my first choice of beverage at home, as I'm typically a beer or Jack and Coke, or bourbon guy.

Being how I must be clean-shaven for work, not shaving until the day before my duty day following a trip is an indulgence.

As for swimming/bathing, nothing more refreshing than a dip in the lake after ice out haha! In reality, taking a dip is dependent on the weather.. Hot weather, I've done so daily to cool off and freshen things up a bit.. colder weather I may do so once mid trip or so. I've always done so just as I was brought into the world, however I definitely keep my eyes peeled and it's always in the back of my head about pike and large, sharp beaked 'hubcaps'. Valid point spartan2 regarding fishing hooks, just have to try be careful, and if I do get pierced hope the combo of clean water and some triple antibiotic ward of anything too nasty.

I never shave on trips till the day I get out. I never really have a beard in Civilization.

In the primeval days, pre 40 years old, we packed vodka to mix with the crappy powered fruit drink the outfitters furnished with the food packs. We matured a bit more and embraced a wider variety including Patron Silver Tequila, Carolann's Irish Cream, Kahlua, etc., and did most of our drinking at the end of the day when bellies were full and chores were done.

Now it is mostly good Bourbon or A'bunadh Malt (Doc will applaud this one) enjoyed in very small amounts, but taken after lunch, after arriving at a campsite but before setting up, as soon as there is a chill in the air or anytime we have paddled in a daylong rain.

The lacquered Sigg bottles we carry it in are stowed with small cups just beneath the rainfly tarp that always goes up first.  Happy Campers.

MossBack

That HAD to hurt just a little 

You weren't kidding!   

For swimming I like deep drop offs and quick entry...
Demonstration of preferred methodology [Viewer discretion advised: video includes brief glimpse of over 50yo backside].
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I drink whiskey in the Q, but for some reason only cheap stuff that I wouldn't touch at home. Makes no sense I know. At home, I drink it on the rocks, but up there it's only "neat". We've been bringing in a couple of boxes of wine and a bottle of Root 100 as a shooter. Don't really do shots much in "civilization".

I would never go in the water up there without shoes--I have a terrible fear of getting a fishhook in my foot.  Perhaps not rational, but nevertheless, I think water shoes are necessary.  I will never, ever go barefoot in camp for the same reason.

As for swim attire. . .when I was much younger and we went deeper into the parks with more solitude, skinny-dipping wasn't out of the question.  As I got less mobile, I felt less inclined to do so, particularly because we were in the BWCA and not always sure about privacy.  But I have always figured that if I am in my underwear, top and bottom, that I am covered as much as a bathing suit and, therefore by definition, "decent", should anyone happen by.  Now that he is on the insulin pump, Spartan1 rarely swims with me, so he watches from shore and helps me in and out of the lake if need be.  There usually isn't a "beach" and I never have done slippery rocks well.

We haven't had a canoe trip since 2013, and I haven't swum on one since 2011, now that I think about it, so this is all talk about the past.  Kawishiwi Lake was the last time.  It was delightful.  It was a hot day and there was a lovely beach.

And the blackberry brandy was never my idea.  My husband was the one who introduced me to canoe-tripping, and on our first trip in 1971 he explained to me that the drink to take was blackberry brandy.  I have no idea why.  I think it is because the guys he went with on his first trip (five fellow camp counselors from Camp Easton on Little Long Lake outside Ely) took it, so that made it "the thing".  We took it in a clear plastic Colgate 100 Mouthwash Bottle on our first few trips.  That was our "flask".   We didn't graduate to bourbon for probably 15 years or so after that.  But to this day, whenever I taste blackberry brandy, I do think, "canoe trip."      And I do like the flavor, too.