getting my stuff together and got a basic electric pump. 4500 max and only runs 25 min and fill 1 litter recomended.... so what is the best options for inexpensive buddy bottles? and ...how many times will fill....say an avenger. how many fills do you get from your 1 litter bottle? still learning and trying to figure everything out, and considering options. thanks guys for all your awesome advice, knowledge and skills! 