Step 1: Mix the Base
In a bowl, whisk together the condensed milk and cold water until smooth. This combination gives the pudding its creaminess. Add the pudding mix and whisk for 2 minutes until thickened. It should hold soft peaks when ready. Set aside for 2 minutes to slightly set, then gently fold in the thawed whipped topping until no streaks remain.
Step 2: Layer the Trifle
Begin by arranging half of the angel food cake cubes in the bottom of a 14-cup trifle dish. This forms the sturdy foundation. Spread evenly with a layer of blueberries for fresh contrast. Spoon half the pudding mixture over the berries, spreading gently for even coverage.
Step 3: Continue the Layers
Top the pudding with a layer of sliced strawberries to add vibrant sweetness. Repeat the layers with the remaining cake cubes, blueberries, and the rest of the pudding mixture. Finish with a topping of the remaining strawberries and blueberries, arranging them in an eye-catching pattern.
Step 4: Chill the Dessert
Cover the trifle and refrigerate for at least 1 hour before serving. This allows the layers to meld and the flavors to enhance, ensuring each bite is harmoniously delicious.