In addition to the development equipment and chemicals, there are a bunch of other materials that you will need.
Storage bottles:
Storage bottles are required for storing the development chemistry. You will require bottles to store the stock solution (concentrate) and the working solution.
Chemical storage bottles come in glass and plastic. Glass bottles are preferred since they are inert to chemicals and do not 'breathe' like plastic. They are also easier to clean. Ensure that the glass or plastic bottles are dark in color to prevent exposure of chemicals to light. BW chemicals get oxidized on exposure to air. This is something to keep in mind when purchasing the bottles. There are chemical storage bottles with 'bellows'; which allow the bottle to grow or shrink, thus reducing the air at the top. These bottles are generally expensive, hard to find, and have a short life because of warping of the bellows. One way of reducing the standing air at the top of the bottle is to drop glass marbles into the storage bottles, till the chemical reaches the mouth of the bottle. Make sure the marbles are 'glass', since glass is inert.
The best way to source chemical storage bottles is from a chemistry lab. If a family member or friend of yours is working with a college or school, it should be easy to get old unused bottles from the chemistry labs.
As an alternative to buying bottles, old medicine bottles and cheap glass storage jars can be used. Medicine bottles are good because they are generally dark in color, have airtight caps and come in standard sizes. If the bottles are not dark tinted, you should store the bottles in a dark corner away from light. Or you could place them within a dark plastic cover. Or just paint the bottle with a dark color. Beware about using generally available plastic bottles or jars. They may not be suitable for storing chemicals i.e. they may either disintegrate, or end up leeching and contaminating chemicals.
I have a Paterson tank (single reel) which takes 290ml of solution. I figured out that 'Christoffel' beer bottles make good storage bottles for storing working solutions These beer bottles come with spring loaded airtight caps which are reusable. The bottles are dark, wash easily, and the capacity is 330ml; which is just about right! So, I have one for storing the developer, and another for storing the fixer.
All repurposed bottles must be thoroughly washed with water and dried before you put in your BW chemicals. Make sure that the caps on the bottles are airtight.
Measuring jars:
Chemicals need to be mixed in correct proportions. To do this, you need a set of measuring jars. The sizes that you will need are 1L, 500ml and 100ml. Jars are available in plastic and glass variants. Plastic jars have a tendency to become opaque and attract scratches and dirt over time. This makes it difficult to read. Glass jars are the better alternative. They are available in cheap glass and borosil. The cheap ones are good enough. In addition to the measuring jars, it is useful to buy a 10ml syringe; for measuring small quantities accurately.
Thermometer:
BW development generally happens at a temperature of 20C. For mixing some of the chemicals you may need to go up to 50C - 75C. Get a thermometer in the 0C to 100C range, with 1/2 degree markings. Digital thermometers are easier to read, but are expensive. Dial type thermometers are not known to be very accurate. A thermometer which has a quick response time is useful.
Film Clips:
You need film clips for hanging up and drying your negatives. The clip at the bottom needs to be a bit heavy, to prevent curling of the negative. Proper film clips cost a bit. Good alternatives are to use alligator clips or binder clips. The clips need to be tight to prevent the film from slipping out. Folding the ends of the negatives helps increase the grip of the clips
Timer:
All steps in film development are timed. You dont need a fancy timer/stopwatch. Most watches these days come equipped with a stopwatch which serves the purpose well. You might even find a stopwatch on your cellphone. If nothing, use an analogue watch and keep time with the seconds counter - it wont be accurate or convenient to use, but it will work. A fancier solution will just make things easier. Keep in mind that you will have chemicals and water around, so, it may not be a great idea to use your expensive watch.
Misc:
Stirring paddle: Useful for mixing up chemicals. You could use an old spoon or fork for this. A thick copper wire with one end bent into a loop makes a good stirrer too.
Funnel: Use a funnel to avoid spilling chemicals when transferring them from jars to tanks to bottles. Funnels are available in glass and plastic. A plastic funnel should suffice. They are easy to find locally.
