We typically go for 4 litres for two people. That would let us rehydrate a home-dehydrated meal and cook some rice or pasta, have a couple of brews in the evening and one in the morning, boil up an inch to wash out our pans, and have enough for our water bottles to reach the first source the next day. Virtually nothing for personal hygiene - use wet wipes, dry-wash and just a mouthful for teeth-cleaning.
Not surprisingly, if going solo I can operate in a similar manner on 2 litres.
When I went for a week's cycle touring on Mull and Ardnamurchan a couple of years ago I drove up and left my car in Oban for a week. I can't remember how I found out about it but I parked for free in the large car park attached to the municipal sports centre. It's through town up the hill to the north of the ferry port - you'll find it easily on google maps - only a 5 minute cycle back down to the port (a little longer uphill on the return!).
It was constantly busy there - I had to drive around for a while to find a space, so leave plenty of time if you've a ferry to catch, but it felt like a pretty safe place to leave the car, and I certainly had no problem, although I didn't actually leave much in the car for the week, and certainly nothing on open display.
For active trips such as ski-touring I settle for a compact in a case mounted on my shoulder strap for easy accessibility.
But almost all the time when I'm walking I take a Micro 4/3rd mirrorless system, so a little bit smaller than a full-on DSLR. I've found a padded case mounted to the hipbelt via mini-krabs works best and doesn't get in the way - I typically chain 2 or even 3 mini-krabs to achieve a comfortable position and so there's some slack for the case to swing or move out of the way. The front point attaches to some suitable loop on the hipbelt, the rear generally goes onto the base of the shoulder strap. I've used CCS and Lowepro cases in the past but now prefer the designs (and rain-covers) of the ThinkTank models, and the Digital Holster fit's my set-up well.
I also use a Peak Designs Capture Pro Clip on my shoulder strap, very similar I reckon to Chewie's ebay link above. Once the camera comes out and I fit the lens hood I don't want to be constantly putting it in and out of its case, but the clip holds it solidly on my pack strap, with the neck strap still over my head for added security, and keeps the camera ready for immediate use - there's not much point lugging a hefty thing around if it isn't quickly to hand when opportunities present themselves.
I'm also a Boreas fan, but while I can tolerate the hood for walking, I agree I found it a bit irritating at times for cycling. So I was really pleased when Rab introduced the Ventus Pull-On i.e a Boreas without a hood
It won't be any warmer than the VR Lite Alpine. The main 'VR' fabrics are the same, and the matrix stretch fabric is no heavier.
I'm not totally anti-hood, I just want a variety so that they aren't on every layer. In the first year that VR-lite came out I ended up acquiring all 4 available items - the Alpine (hooded), Jacket (hoodless) Stretch Pull-on (hoodless) and stretch vest (hoodless). I often layer 2 (or even 3) of them, but, especially if I might also need to wear a shell at some point, I'm happy to only have the hood on the Alpine. (and the Alpine doesn't figure in my choices for cycling.)