I am getting a lot of feedback, thank you.

I will check that Army field manual.

To answer Arney's question, I am looking at how much should a
person drink in one day.

Personally, I take a full camel back bladder on my outings and based on the feed back above, I probably don't drink enough while hiking. This was an issue in Glacier Park last summer when I drank the bladder down on a 8 mile hike. I was able to replenish quickly but, still, should probably have done so more frequently.