Mr Saltburns (don't see your real name on the RC decoder post), it really is simple to make. As Jay said, just buy some Wages Pickling Lime and you will have enough for a lifetime. If fact, Pam gave me a bunch a year or so ago when I bought a coral from her. I have used it several times and have not made a dent in it.
1. 1 tsp. pickling lime - food grade calcium hydroxide
2. 2 tbls. tap water.
You do not have to be precise, just make add a small amount of the powder in a bowl and add a little water and mix. Then keeping adding a little water until it looks like toothpaste. If you get too much water, just add a little more powder .....easy...easy..easy. I had a left over syringe from an old AipX or something that I use.