Cook and Dry Spinach: Cook spinach according to the package directions. Let it cool slightly, then press out the water with paper towels in a colander. Spread on a baking sheet between fresh paper towels and press again until very dry.
15 ounces frozen chopped spinach
Mix the Base: In a large bowl, whisk together mayonnaise, sour cream, and the vegetable mix until smooth.
1 cup mayonnaise, 1 cup sour cream, 1 packet Knorr Vegetable Recipe Mix
Prep Veggies: Dice the red bell pepper. Drain, rinse, and dice the water chestnuts. Stir them into the creamy base.
1 red bell pepper, 1 can
Add Spinach: Fold in the spinach, breaking up clumps as you go. Cover and refrigerate for at least 1 hour to let the flavors blend.
Make Olive Spiders: Cut half the olives lengthwise for spider bodies. From the rest, slice pieces for heads and thin strips for legs.
12 large black olives
Decorate and Serve: Transfer dip to a serving bowl, arrange olive spiders on top, and serve with crackers, chips, veggies, or bread cubes.