The best way to do Vodka is Hack Juice or Jello shots.

Hack Juice:

1 liter Vodka
2 cans frozen orange juice
1 packet Tropical Punch Kool aid
NO WATER
Mix. Good Luck.

Jello Shots:

Chill Vodka in freezer
Prepare 2 packages Jello as per instructions on box except when it comes time to pour 2 cups cold water use 10oz chilled vodka and 6oz cold water instead. Pour into small plastic cups. Wait for them to set.