1 package Good Seasons Italian salad dressing mix -- zesty, preferred
1/4 cup balsamic vinegar
3 tablespoons water
1/4 cup olive oil
1/4 cup water

Pour 1/4 balsamic vinegar into Tupperware salad dressing container; add 3 T water. Add seasoning packet and shake thoroughly to combine. Add 1/4 cup oil and 1/4 cup water (or 1/2 cup oil if you prefer), then shake again to combine.

Refrigerate and shake before serving.