Plan ahead with water to save weight. If need energy from drinks, bring electrolyte pills instead.
Do not carry water if you think you are going to pass several streams. Instead, buy one of those collapsible plastic cups and keep it in your pocket. When you come across a stream, pull out the cup and drink from the stream. It beats bending over with a pack and drinking from the stream.
here's what one looks like:
http://www.shopzilla.com/8N_-_cat_id--12040100__nwylf--__oid--702179962