you can find cheap pumps on ebay,as far as the distilled water goes I dont know if you will be able to grow a plant to harvest without some type of nutes,and for the auto's they dont require alot of nutes from what I have read but I have only grown a few autos in soil in the past.you also will need a ph meter or test kit and a ppm meter before you consider doing any type of hydro,with out these items you will never know what your ph is and what your ppm is,these are critical to a good grow and I wouldnt try hydro without them.you may want to do alot of reading before you get started so you know what you are getting into,hydro is a great way to grow but there is more cost involved in getting started and keeping your plants healthy and happy,I would sugest dwc for your first grow,its a bit easyer and cheaper if you build your set up yourself. all you need to know is here if you look and read. good luck