Hey I appreciate the offer! We might just have ourselves a shindig going on up there this year! I'm really looking hard at SW Colorado. From what I can see there look to be plenty of lakes and creeks way up high, so I would think filtering shouldn't be a problem as long as I wouldn't have to drop down too low to get to good water. I'm assuming the lakes and stuff up there would be no big deal for drinking and wouldn't need much purifying?Your body will shed water through urination to adjust to elevation. Double your normal. A good filter or iodine or time to boil and cook water make up for what you don't have on your back. Most of the central and northern rockies have fairly abundant water sources. I'm also in CO and would be willing to do a BP trip with whomever what's to scout or check gear or even just get out and away.