Yes, it is possible to make bath bombs without citric acid. There are several recipes available that use alternative ingredients such as cream of tartar, lemon juice, or vinegar to create the fizzing effect. Some sources for such recipes include Country Hill Cottage, The Spruce Crafts, and WikiHow. However, it is important to note that bath bombs made without citric acid may be softer and crumblier compared to those made with citric acid.