I measured equal parts vodka and tomato juice, 50ml (1.5oz)each.
For the gelatine to dissolve the liquid it will be mixed with needs to be hot. I heated the vodka tomato mixture in the microwave for about 2 minutes on high, then poured the hot mixture into a blender with fresh basil, the powder gelatine was sprinkled on top.
As anyone who has made alcoholic jello shooters before knows, alcohol and gelatine aren't always the best of friends and sometimes more gelatine is needed to ensure the liquid set firm. For my 100ml (3oz) of liquid I used 4-5ml (about 1 teaspoon).
The hot mixture was blended for about 30 seconds to ensure good incorporation of all the ingredients.