You will need to buy a coagulant. I recommend ’nigari’ crystals, which can be bought online. You can also use sodium chloride, Epsom salts or lemon juice, but in my tests nigari was the best. I also invested in a plastic tofu mould, although you can use ordinary kitchenware, for instance a plastic Tupperware-style box with holes punched in the bottom, to achieve a similar effect. You will also need a muslin and a metal sieve.