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Once the dishwasher has stopped, shake all the bottles again.
Place the bottles in the freezer for a minimum of two hours.
The cold vodka should have a syrupy texture.
Place the mixture through a strainer.
Once you have emptied a bottle, rinse it out before pouring the strained mixture back in.
Repeat the steps for each bottle. Make sure that the bottles are rinsed out in between uses so there is no color contamination.
Freeze the bottles until you are ready for a colorful drink.
No need to worry about the bottles, the vodka will not freeze.
That is the end.
Enjoy drinking the rainbow of bright colors.