Just a few thoughts.
A gallon of USA water weighs 8.35 pounds while a Canadian water weighs 10 pounds.
I usually estimate a US quart as a litre (0.946352946), or 1,000 grams (2.2 pounds). Water is heavy no matter how you carry it and resupply is a definite must.
Consider the weight of a gallon of water again. If you are supplying all needs from you pack one gallon a day is prohibitive to pack.
This means water treatment usually must be available if you are going for more than a day. The weight of the water soon overides the weight of the containers.

I have carried water in a lot of different ways and they all have advantages as well as disadvantages.
Metal has an advantage as far as heating water right in the container.
Plastic wins on cost.
Weights between plastic and metal are usually comparable. Metal can be a lot thinner than plastic to do the same job.
What you sacrifice for weight saving is usually balanced by what you lose in durability.

Over the years the most common problem I have had has been leaky caps.
This has been far more common than leaking seams or holes. Even the Nalgene bottles are not immune to leaky caps.

Water bags like camel back bladders and bota bags have the advantage of compressing as you empty them.
Air might not weigh much but empty containers still have bulk.

I like carrying a stainless steel thermos (Thermos brand are reasonably light) which lets me carry hot or cold and is usually enough for a day.
1 litre Plastic pop bottles are my next choice based on cost and durability.
In hot weather freezing water in plastic bottles is good. It usually melts just fast enough to supply you with cold water all day.
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Blanket/sleeping bag depends on time of year and the rest of your system.
I find wool too heavy for the pack. Good synthetic bags work for me. If you use the compression sack right you can get them down fairly small.
I have a Woods 5 star that weighs about 5 lbs, but that is far too heavy and bulky of a bag except during deep winter. It almost requires a pack just for it.

I like down for packing but hate it for being vulnerable to wet, so I tend to used medium weight bags filled with Polartech II insulation (or similar).
I find the problem with sleeping pads to be bigger than with the cover though. You need at least 2x as much insulation under you as over you. This is even true if you are sleeping in a hammock or cot.
Air pads risk puncture and compression making them useless.
Ensolite (blue foam) does not compress well so you carry a lot of air in your pack.
It certainly helps to pile leaves and other insulation for a bed but it is not always possible to find dry bedding material.
Hopefully somebody will find a way around this problem.