Our family BOB resembles this set up - stainless steel water bottles, nested in cans, nested in stainless or aluminum cups. we also have some empty platypus bags, MicroPUR tabs and a katadyn pocket filter.

Our daypacks house the nesting bottle/can/cup, microPUR tabs and a Frontier straw filter, except for our 9 yo's. He often chooses a GI canteen and mess cup.

My edc set-up is slightly lighter, with a nalgene and a camp cup, along with some microPUR tabs.