1) A one gallon glass jar with a screw-on lid: You can get on at Amazon through that link or Home Goods is a good place to get these locally for a reasonable price. You can get smaller ones for smaller batches but I wouldn’t recommend it unless space is really THAT tight for you. I’d also recommend having 4 of them if you plan to make numerous batches of Limoncello for your friends too.
2) A permanent coffee filter. That link is to the exact one that I use, just a basic plastic model. You can buy these at any grocery store and the ones with the flat bottom are best.
3) A supply of unbleached paper coffee filters, again, the flat bottom ones are best. That link is to the exact ones I use and you go through a lot of them so get a decent supply.
5) A Microplane Zester: Let me save you some time here, don’t even bother with any other kind of zester.
6) A Brita pitcher (or comparable product) and a supply of filters
7) A ladelladel. I like one with a steep angle of the handle that allows me to get to the bottom of tall jars and has little pour spouts on the sides.
8) A funnel. I use a plastic one but I now use metal or glass rather than plastic whenever possible, so when I break the plastic one I’ll get a metal one.
9) Not completely necessary, but it’s a waste not to use the rest of the lemon after zesting so I recommend a citrus press to extract the juice from the lemons efficiently. I bought a decent one at Home Goods for about ten bucks. That was lucky on price but as you can see it’s hot pink so I can’t leave it out on the counter, stainless is better that way.
10) Labels or paper and scotch tape to indicate which batch is which. I use this label maker for marking my limoncello batches and all kinds of other stuff. It seems overly anal to buy a label maker but once you get past that you’ll find it all kinds of useful.
11) A vegetable brush or other plastic scrub brush for cleaning the lemons