So I am a little confused about mixing and storing chemicals. I have bought all ilford products (500ml bottles) and I am unsure if I need to make up the whole bottles (which I would prefer not to do) or if I can do just a bit at a time? I don't really know what I should be storing chemicals in, what do people normally use. I don't really have anything on hand, and the photo store does not selling any chemical storage bottles. This was all done for me when I was in school so I have never mixed myself and I feel nervous and I don't want to do the wrong thing and waste my money! Thanks! I am anxious to get started but I want to do things right!