Each alcohol ink class will have a specific supply list for that class. Here is a short video about basic supplies. You can also use what you have. These are some of the most usual things we start with alcohol ink painting.
There are many more colors, substrates, and art supplies you can add as you grow.
(This is a module from my free alcohol ink course.)

BASIC ALCOHOL INK SUPPLIES ——- DELUXE ALCOHOL INK SUPPLIES