RD, the best way to make it is put the NaOH or KaOH in the cylinder, add the gbl, then add a small amount of water at a time, then agitate till reaction occurs, keep adding small amounts until all the NaOH has reacted, then fill the rest of the way with water, i fill to 700 or so ml. For what you made, it would take me 4 caps to catch a good buzz. I'd start with three regular soda bottle caps to get going