I’ve been carrying the Bota “Outback” for some time now…

http://store.botaofboulder.com/merchant2/merchant.mvc?Screen=PROD&Store_Code=BOB&Product_Code=outbackSystem&Category_Code=FS

But pick your favorite. I like this one because it has the built-in lexan guard over the top, so you don’t have to suck on a dirty “straw”. Because you can “squeeze” water out, you can also use the Outback to filter a glass of water to drink the “real way.” It filters 99.9% of the Giardia Lamblia and Cryptosporidium cysts — without the iodine that’s not so good for you. It’s also easier to squeeze so you get a slightly faster flow rate than most bottles. Either way, bring along *something*. I’m here in Spain as I write this. Sure the water is clean in most of Spain. But today I’ve spent most of our day in a 700-year-old community. There’s no way I can be sure that all these pipes are new. Having the filter, I can pretty much be assured of pure water, any time I want it. Besides, it’s great to have a water bottle anyway, and if you’ve got to carry one, why not carry a filtered one! :-)