You can fill your hydration bladder with the included quick-release hose kit. 

• Easy to use: fill and hang the ultra-durable HydraPak® 3.0L reservoir using the integrated Bail Handle & Carry Loop; filters up to an impressive 2 liters per min.
• Easy to clean: simply shake or swish the EZ-Clean Membrane™ to remove debris
• Collapsible 3.0L reservoir packs down small
• 0.1-micron microfilter is tested to protect against harmful organisms, removing protozoa (99.99%) and bacteria (99.9999%) to EPA standards
• Please note: the initial packaging incorrectly stated that this product meets EPA standards for virus removal. Refer to the product manual for more information.
• 43mm, wide-mouth opening makes for easy filling from any lake, river, stream or faucet
• Tested to 1,000 liters; individual results will depend on water quality
• BPA-free