Randy
I recently purchased a surplus ILBE assault pack off of Amazon for my day hikes
I paid like $35 for it and it is a quality product

When I know that I am hiking by the river i only take a liter of water, otherwise I take my 2L water bladder and my 1 liter bottle

On my pack I added a drop pouch, just in case I find something that I want to take out
I also added a small pouch for my camera, phone and keys