Wups, sorry. I haven't checked this in a while.
If you want to go quilts, I can't say enough good things about JRB. I have their Rocky Mountain Sniveller. They aren't the lightest quilts out there, but they are solid. Also, they're cut square rather than mummy-style, so the footboxes can seem a bit big. But the square shape and non-permanent footbox also makes them a bit more multi-use, especially since you can wear them as an insulated poncho, too. I got the omnitape modification on mine and use it with JRB's Down-to-Earth sleeping pad. I think this makes everything a bit more roomy, which is important to me as I move around a lot when I sleep and tend to sleep on my side. It also eliminates drafts. But it adds a couple of ounces.
I've also got a BPL/BMW Cocoon UL 180 synthetic quilt, but I've barely used it. (I am guilty of erring on the side of warmth, and my current hiking digs can surprise you with the weather, even in summer. Thus the RM Sniveller.) The UL 180 is what it is- a very minimalist quilt for those who live the BPL party line, and layer insulating clothing when they sleep. Wicked light, though. I'm happy with it- understanding its limitations. I keep it around for when I get in a lunatic-fringe mood.
You can easily spend $500 on a cutting-edge Nunatak quilt if you try. enLIGHTened makes some lunatic-fringe quilts out of cuben fiber.
But since you mentioned wanting a good quality/price tradeoff, I'll stand by JRB. (At least if you're interested in down rather than synthetic.)
The only "tarp" that I have any great experience with is the SMD Gatewood Cape, which is also my raingear, but it is only for when I'm in my lunatic-fringe kinda mood. (Otherwise I have a TT Moment and GoLite raingear.) It's a great product for what it is, but it is what it is- a compromise. I do think that it makes a far superior solo shelter than most poncho-tarps marketed by others. (I combine mine with MLD's rain gaiters.) And it has a pocket, and a full-length zipper down the front of it, both of which most other poncho-tarps lack. A single trekking pole works as a tent pole, but it does require a minimum of six stakes, and pitches sort of like a pyramid tent.
I have an Oware silnylon bivy which I do like, due to it's no-frills simplicity. But if you're going to be a dedicated tarp camper you may want something a bit less minimalist. I have no experience with any other bivies, as this is my first and only.
I sort of conform to BPL groupthink regarding water bottles. I just re-use old PET soda/juice/gatorade bottles. (They are very light, especially compared to hard-sided Nalgene bottles, etc., and quite acceptably durable.) The exception is that I use a Sawyer 4-way water filter, and use the scoop-and-run bottle that they make for it. (Walmart markets a slightly bigger filter/bottle setup, if you're interested in Sawyer. I take every opportunity to pimp for them.) The standard Sawyer bottle is semi-soft-sided and reasonably light, but the Walmart bottle looks like it may be more equivalent to a Nalgene.