Spinach Dip

1 Package Frozen chopped spinach (thawed and drained)
1 Package Knorr's vegetable soup mx
1/2 cup Sour cream
1/2 cup Mayonnaise
1 small Onion (chopped)
1 can Water chestnuts (chopped)
1. Mix all ingredients together the day before serving
2. Refrigerate
3. Serve with fresh vegetables or with crackers