Here is how I do it:
I only wash and make bottles once a day so as I use bottles and pumping supplies, I rinse them and put them in the left side of my sink.
I scrub them down with dish soap and a bottle brush and put them in the right side of the sink (I put a stopper in to make sure the nipples don't go down the drain.
I put the milk in a measuring cup (so I can wash the pump bottles).
I fill all of the bottles with 2oz each.
When it is time to make a bottle, I have water and formula on the counter.
I add the water and formula.
I know it seems like a lot of work pumping, storing, making bottles, feeding bottles, and washing bottles, but it is worth it to give Nathan every ounce of my milk that I can for as long as I can.