Start with a small amount of acrylic paint
Add water a few drops at a time
Stir thoroughly after each addition
Use an acrylic medium for better paint strength
Add flow improver for smoother application
Use glazing medium for transparent thinning
Use matte medium if you want less shine
Use pouring medium for fluid paint effects
Avoid adding too much water
Test the consistency on scrap paper or canvas
Adjust gradually until the desired thickness is reached