My current hydration system consists the following.
Water Bottle - Tantonka Stainless Steel Water bottle -
http://www.amazon.co.uk/Tatonka-Stainless-Steel-Bottle-1000/dp/B000G4XI3GDrinking tube - Smartube -
http://www.bluedesert.co.il/smart_tube.htmlWater Bottle insulation - Sigg Neoprene water bottle cover -
http://www.amazon.com/Sigg-Neoprene-Water-Bottle-1-0-Liters/dp/B000RI6BTO/ref=pd_sim_sg_1_imgWater purification system - Steripen Classic -
http://www.steripen.com/steripen_products.html#classicThis setup may require a pre filter depending on the type of country you are in. i.e. some ceramic or glass fibre filter with activated carbon or even just a millbank bag although the water I will usually come across is generally clear from fresh running mountain streams. Generally this setup gives me good flexibility and is quite lightweight and fast to ensure that the water is ok to drink.