Take the lids off your squeeze bottles and squeeze several drops of each food coloring in a different bottle. You can usually pick these plastic bottles up at Dollar Tree but if you are unable to find them I located some HERE on Amazon for you to grab.
Carefully fill the bottle up with cold water, not too fast or it will bubble over. Leave an inch space from the top. If the color is too light, add more food coloring to achieve a more vibrant color of snow paint.
Tightly place the lids back on and wipe down the bottles well, replace the cap until ready to use.
With the cap on, shake before use. Then carefully take the tops off and use them to paint in the snow.