I carry little more then 12 to 15 lbs when backpacking - to cut more weight get rid of the heavy boots. Unless I'm in cactus country they're not needed, instead I use my mesh river shoes with no socks,
In warm weather ( late Spring to early Fall) I carry a Haglof LIM 5 sleeping bag, packs to the size of a loaf of bread, and weights 1 lb.
For a stove, I've found the home made alcohol burners worthless, and more trouble then they are worth....I carry this one instead ...
SIERRA STOVE, or a pocket rocket if I'm headed above the tree line....
For shelter if needed, a sil tarp - very light...
My backpack is a NRS Paragon Pack ...
NRS Paragon Pack
The majority of time the Paragon carries a stripped down Adirondack pack basket,
http://www.adirondackpackbaskets.com/
however during wet weather it's easy to swap it out for a waterproof drybag....
For treating water - the Steripen ....
SteriPEN Adventurer Opti Water Purifier at REI.com
a few coffee filters added allows to clean out any sediment before use...