Camping and The End of The World!

First time in a while that I was able to remember enough of my dreams to be able to write them down.

First one was of me backpacking through some wilderness somewhere. I had very basic essentials with me but no water. I never mentioned food, so I assume that I had plenty with me. Most of the dream involved me finding various water sources and purifying them some how so I could drink it.

Second one was an End of the World type adventure. I don't know what event happened that caused it, but the world was in apocalypse style mode. I don't think it was zombies. Anyway, my girlfriend and I were driving along a river when something huge dropped in, creating a big shockwave/wave that traveled along the river getting bigger and bigger. It felt like a chase scene. When it reached shore, it began to flood the nearby towns. For some reason, we had to abandon our car, and we began to search for a new car. I really wanted to find a truck. All the places we searched had either dinosaur or Native-American styled cars and houses and trucks. Right as we found a truck that worked and was in good condition, I woke up.

???

I've forgotten some of this because I'm writing this down late, but I could hardly remember it all when I first woke up.

There was a lot of driving down the highway, sometimes on the wrong side of the street. I got to a convention hall, where I met up with my old high school choir, then my old Boy Scout troop and signed up with the Army from the 1920s. There were doughnuts and coffee involved somehow, and I was flirting with everyone.