This martini can be made into a less alcoholic cocktail with the addition of 1/2 to 1 cup milk mixed with the alcohol.
If you don’t have a martini shaker, use 2 plastic cups. Mix the alcohol and ice in one cup, and place the other cup upside down on top of the first cup. Hold tightly and shake. Strain the martini by cracking the plastic cups apart, being careful not to let the ice through.