The minimum
Dark tea is the one category that genuinely needs a tool the others do not, and that tool is a pick.
Compressed cake will not break apart cleanly with a knife, and prising it loose tears the leaf.
A cha zhen（茶针）costs very little and lifts whole layers off a cake without shattering them.
Alongside it you need a vessel that takes boiling water, and a small porcelain gaiwan is the safe answer.
A gaiwan lets you rinse the leaf and pour the rinse away, which every compressed tea needs.
Water at 100 °C is right for the whole category, and anything cooler leaves the liquor thin.
A kettle that boils is therefore enough, and a thermometer is close to unnecessary here.
A strainer matters, because compressed leaf always sheds fines however carefully you prise it.
One cup, one gaiwan, one pick and a kettle will brew every dark tea sold.
Skip the tea tray on day one, then buy one when rinse water starts pooling on the table.
Loose dark tea needs none of this, and a 250 ml mug will handle a fu brick perfectly well.
Start from the form you buy, cake or loose, and the set builds itself from there.
Add as you go
A fairness pitcher comes first, because the liquor from a cake darkens sharply across one pour.
One of 200 ml lets you decant quickly instead of leaving the leaf sitting in its own liquor.
A scale reading to 0.1 g is second, and compressed tea makes it more useful than usual.
A chunk broken off a cake looks like a dose and rarely is, since density varies across it.
Weighing turns a guess into a number you can repeat next month.
A tea tray（茶盘）matters here earlier than elsewhere, since rinsing is not optional.
A tray with a drain and a hose is easier than one you have to empty by hand.
A second cup earns its place once you compare two cakes, which is how the category is learned.
Two 50 ml cups are enough, and they let you run two samples side by side.
A zisha（紫砂）pot is a fair addition for dark tea, and ripe pu-erh is the usual reason to buy one.
Clay holds heat through a long session, and it will hold the fermentation note permanently afterwards.
Decide that only after you know you will still be drinking this a year from now.
Where to spend
Dark tea is the category where storage and age dominate price, so buy from a seller you trust first.
The same cake stored badly for 5 years is worth less than a young one kept properly.
A vessel ranks well below provenance, and a pick ranks above both in usefulness per dollar.
A pick and a tray together cost less than a mid range gaiwan and change the session more.
Porcelain at 100 ml is cheap and neutral, and ripe pu-erh will not leave a trace in it.
Check that the glaze is intact, since a crazed surface will take up smell over time.
Boxed sets are poor value here too, and the brush and tongs serve a ceremony rather than a brew.
A small pot is the size that suits the ratio, and a large one will overbrew the leaf.
A zisha pot is the one place where money can be justified, and the easiest place to lose it.
Anything sold as zisha（紫砂）below 20 dollars will be slip cast and tinted rather than hand built.
Smell a warmed empty pot, and a sharp chemical note means the clay or the colouring is wrong.
Buy leaf with a known history, and let the ware stay cheap until you know what you drink.
One set, many teas
One porcelain gaiwan covers dark tea, ripe pu-erh and red tea without any argument between them.
All three brew at boiling, and all three rinse clean out of porcelain.
Keep them away from green, white and yellow, which need cooler water and a shorter steep.
Anything porous has to be dedicated, and that is the real rule behind the one pot per tea advice.
A clay pot used on ripe pu-erh will never again make a clean cup of white tea.
Two vessels, one porous and one not, is enough for the whole shelf.
The non porous one handles everything you drink occasionally, and the clay one handles the habit.
Rinse compressed leaf once before brewing, and discard that first pour every time.
The ratio is 5 grams in 100 ml, with water at 100 °C and 30 seconds on the first real infusion.
Extend each later steep by a few seconds, since a cake gives out slowly and unevenly.
Reject any cake that smells damp or musty after the rinse, whatever the seller says about age.
A pick, a gaiwan and boiling water, and the category is open to you.