How to liquify thick dyes?

Currently working on a Christmas present for my little cousin. He loves hitting golf balls out in the forest and figured maybe if I dye a bunch of these golf balls it will be easier for him to go out and find them. My idea is to use Rits dye and mix it in with a neon dye. The neon dye that I bought is extremely thick and can’t liquify it to mix in with the Rits. Is there anyway possible I can thin out this neon dye? I would love for this to work. I am using Alumilite neon dye. Thanks guys - josh