Banana Pudding with Vanilla Wafers

Ingredients

• 2 cups white sugar
• 6 tablespoons all-purpose flour
• 4 large egg yolks
• 6 tablespoons water
• 4 cups milk
• 5 large ripe bananas, mashed, or more to taste
• 1 teaspoon vanilla
• 1 (12 ounce) package vanilla wafers