Gear opinions

When life gives you lemons, make lemonade. Blah, blah, blah. However, looking at a partial or full summer of no running is not without positives. Steve was once a backpacker, and has shown some interest in spending the summer camping and hiking. This has opened up a whole new world of gear - isn't that half the fun of sporting endeavors anyway? I've got backpacking and trail running gear already, but what I'm looking for is lightweight gear for long day hikes with possible big weather changes and the need to treat water.

Let me know your thoughts on the following:

Water purification - I've used the Aquamira but it's kind of a pain. Looking at the SteriPen with Iodine tablets as a backup... Shell - I want something reasonably inexpensive that is highly water and wind resistant. I get cold quickly when the temperatures drop. I've learned to carry layers, but would like this to help with warmth if needed. Anyone use the REI ultralight jacket?

Pack - I'd use my Nathan race vest all the time if I could, but I want a pack that has side bottle pockets. Not too many to choose from and I'm leaning toward this one by GoLite. Hoping REI has one in the store that I can put on. Some of the packs are just too big on me.

Any thoughts on trekking poles or other fun gear I haven't researched yet? Not that I necessarily need any of it, but it's fun right?