Back when I was still living the contiguous lifestyle, I listed some goals to work on in Alaska. Goal #4 was:
"Hike. A lot. And then consider stepping it up a notch to backpacking."
And away we go - first week of June, Eagle River, Alaska:

As you may be able to tell, it was raining. This is a short trip - only a couple miles out to the first of several designated camping areas (by which I mean a piece of flat, cleared ground - not always easy to come by around here). We figured we'd put on the raingear and waterproof backpack cover, hike out, and if the rain was too much, just hike back in and go to Plan B.
It's amazing how much it costs to "rough it." I needed a new tent, new bag, new pad, camp stove, water treatment, etc. etc. etc. Did I already have a tent/pad/sleeping bag? Of course. But for CAR camping - WAY too heavy. On this trip I had the smaller tent, but still my old sleeping bag and pad - I kid you not they took up half the backpack! The ones I have now weigh half as much and take up a third of the space. Oh, and as you can see, after sliding down Rainbow in a previous post (still have a scar from that one) and getting turned back by the river on the Denali Highway by slippery rocks, I scored some trekking poles!
I was nervous about forgetting something, or something going wrong, and it was comforting to know it was only a couple miles back to help/safety. And right on cue - SOMEBODY forgot to bring matches/lighter. Luckily, and completely by chance, I ended up finding some in one of my "diddy bags" in my pack. Cold hot dogs don't sound good.
Between a bit of constant light drizzle and some serious sweating while traipsing around to find, cut, and carry wood for a fire, I was soaking wet. When it started cooling down, it was nice to have a fire handy to dry the hair. Took less than 30 seconds.

You can only carry so much water in your pack because of its weight, so you have to be able to get your own water out there. One of my trepidations was needing to use a filter/purifier. I tried it out in the sink, but that's not exactly field conditions.
The main concern with filtering/purifying water is to avoid giardia. Those microscopic little buggers get in the water from animal business, then if they get in you, you get really sick for a really long time (up to six weeks).

"Glacial river" may sound refreshing (and it is), but in the case of Eagle River it means the water is completely opaque from "rock flour" - pulverized rock scoured from the mountains. I've come up with a better 2-step plan since, but believe it or not this filter, when pumped slowly, took that opaque turquoise-gray water and turned it clear as tap water! Add a few drops of "MSR Sweetwater" purifier solution, wait a few, and you've got some great tasting water!

Then again, when it's you're first run, it doesn't hurt to say a little prayer you don't get sick.

Suffice it to say, we lived. Oh, and if you're wondering what that deal is strapped to the top of the backpack - it's a bear keg (in a carrier). It's a bear-proof plastic food canister bears can't get into. The tree line is pretty low up here, so it's handy to have. Even though there were plenty of trees to put food up in this trip, I left the food on the ground (far from the tents, in the woods) to give it a test. The next morning it was untouched (though I would have been happy to find it flipped over and not where I left it).
Lesson One: GET LIGHTER GEAR!