I use this method. This will keep the whipped cream from weeping for a full day, contributed no additional flavors, and won't noticeably change the texture of the whipped cream.
To make 3 cups of whipped cream: sprinkle 1/2 teaspoon of unflavored powdered gelatin over 1 1/2 tablespoons of water in a microwave-safe bowl and let it stand for 3 minutes. Microwave the mixture in 5-second increments until the gelatin is dissolved and liquefied. Whip 1 1/2 cups of chilled heavy cream (along with 1 1/2 teaspoons of sugar and 1/2 teaspoon of vanilla extract, if desired) in a stand mixer, staying on low speed until small bubbles form and then increasing the speed to medium. When the beaters begin to leave a trail in the cream, slowly pour in the gelatin mixture and then increase the speed to high and continue to beat until soft peaks form. If well covered, the whipped cream will retain its moisture and air for up to 24 hours.