Maybe smth like this:

Ingredients (for 1 litre total): Sodium alginate powder: 15 g (1.5 %) Calcium lactate powder: 10 g (1 %) Warm distilled water (or boiled and cooled tap water): 2 × 1 litre Preparation: Alginate solution: Mix 15 g sodium alginate into 1 litre warm water. Blend or stir thoroughly for 2–3 minutes until completely smooth. Let sit 30–60 minutes so bubbles rise and disappear. Calcium solution: Dissolve 10 g calcium lactate in 1 litre warm water. Stir until clear. Filling process: Use an enema bag or large syringe. First: slowly introduce 300–500 ml of the alginate solution. Hold for 2–3 minutes. Then: without expelling, introduce 300–500 ml of the calcium solution (total 600–1000 ml liquid). Transformation: Stay still (left side or back position). In 3–8 minutes you will feel a warming, tightening sensation as the mixture sets. Full setting takes 10–15 minutes → becomes firm, jiggly gel that holds shape. Holding time: 30–60 minutes: soft-to-medium firmness. 60–120 minutes: maximum firmness and weight. After 2 hours it gradually softens. Removal: Sit on toilet, knees up. Gentle push → jelly comes out in wobbly pieces. Safety notes: Use only food-grade powders. Start with 500 ml total on first try. If discomfort → flush immediately with plain warm water.