There really isn't much you will need, most of it you probably have in your kitchen already but we have listed the main pieces below.
When we refer to a double boiler, or a bain-marie, we are referring to a cooking vessel consisting of two nested pans, designed to allow slow, even cooking or heating of ingredients in the upper pan, without scorching or denaturing, by the action of water boiling in the lower pan. It is very important that the water in the lower half of the double boiler is actually boiling – this will ensure that the ingredients in the upper pan or bowl will melt successfully.
You can improvise a double boiler, if you don’t already have one – with two saucepans or a saucepan at the bottom and an ovenproof or stainless steel bowl at the top.
Just a simple cooking thermometer like this one is all you need, you can get them on Ebay or Amazon for under £5
You will need a couple of larger bowl to sit in the saucepan and some smaller dip sized bowls to measure out your ingredients
Perfect for blending your creams ad lotions
Most of us have them nowadays but if not you can pick them up very cheaply. They need to be able to measure from 0.1g - 1000g
The ones here are from amazon for around £8