Apologies for the seemingly cryptic subject title. I'm nearly finished setting up a simple darkroom in my garage and I just want to see how much of each chemical do people make. I will probably do 3-4 darkroom sessions a month. Nothing crazy. I have 2 of those concertina type containers which collapse to remove air. I was thinking of making up some fixer and stop bath, and keeping about 1 litre each of those chemicals in each of the containers. I assume most people here wait until just before they print to make the working developer solution....so assuming I want approx 1 litre of developer solution, is it ok to use a 1 litre soft drink bottle to store the developer assuming it's not exhausted. Or would you guys advise me to use one of the concertina containers for the developer and a soft drink bottle for, for eg. the stop bath. Does it even matter? I'm using Ilfostop, Ilford rapid fixer, Ilford MG developer. Ta!