FWIW, I much prefer the stainless steel reels to Paterson ones because I find them easier to load and I don't have wait until everything is completely dry with the plastic reels. That said, I think I went with the Hewes reels initially because I had read they were easier to load for MF film than the plastic ones, but that just may be user preference.
As for other supplies, I bought most of mine from photo stores, but as Matt said, you can buy equivalents from dollar stores or in the household section of others. Because I often have a backlog of film, I have multiple tanks and reels - I can load them all up at once and get an assembly line going once I start developing. Here's what I have equipment-wise (bear in mind this is what I've built up over the years, I didn't have everything at the beginning):
-3 large
metal tanks that hold 2 120
reels each and 1 small one that holds one reel (I have 7 reels). I also have spare plastic lids for when they eventually start leaking over time.
-6 graduates that hold 1-1.2L each - one dedicated to developer, stop, fix, and HCA/washaid (not absolutely necessary for film but I was trained to use it and it helps reduce water wash times/usage). The other two are spares - either for water stop/pre-soak, or if I am also using an alkaline fixer. I also have a large 5L graduate that is useful for mixing powders, since they range from 3.5-5L total.
-3-4
stirring paddles, one for each graduate, although you could just use one and rinse between mixing.
-1 cylinder (up to 50ml) for measuring small amounts of chemicals
-a few syringes for measuring out small amounts of syrupy chemicals (like HC-110) or developers that use very small amounts (like pyro-based ones). The ones I have go up to 6ml.
-1 or more thermometers to check chemical temperatures. For colour you would need a really accurate one. You may find that if you have 3 different thermometers, they will all read temperatures differently (1-2 degrees +/-). I tend to use the same one for critical temps (like developer) and others for water/non-critical temps.
-10 (or more) opaque storage bottles, usually 500ml to 1L capacity. Most of my developers are made from powders (D-76, Xtol, etc) so I need to be able to store the stock somehow. I like the accordion style ones that I can squeeze the air out of. I also have a few spares for keeping working solutions that are still good (like stop and fix). I never use replenished developers (other than Diafine) but having extra containers would be good for that. When I've run out of "proper" photo bottles, I've used larger green/brown beer bottles with resealable lids for chemical storage, and I know some people use wine bladders. Even regular plastic bottles are okay short-term if you keep the chemicals in a dark place otherwise. Having some kind of
protection spray to keep chemicals from oxidising is useful but not necessary if you use them quite frequently.
-a way to hang film. I use those small laundry racks (often used for drying underwear) that I hang from a pole in my bathroom. I just use regular clothes pins to weigh down the film. You can get simple plastic ones from the dollar store (something I did for years), but I recently got metal ones which a like a lot more since they don't twist around and hold the film (or paper, if and when you start printing) absolutely straight. (similar to
this, although I got mine at Muji which are a lot cheaper)
-something to keep your negatives in. I use
Printfile sleeves, the ones that also will store a contact sheet with them. I always try to have a good supply of them so I don't run out and then have no way to store my film once dry.