Most of the parts will fall off because they are no longer needed. Stamen and petals will fall off (I cannot think of a plant where this doesn't happen). Sepals may or may not fall off. Think of a strawberry or a tomato. The leafy structures on these fruit are actually the remnants of the sepals.
Some pills are completely water soluble and therefore would dissolve in water faster than other liquids which are a mixture of water with other compounds. In some cases the sugar in Kool Aid and in Cola may cause some inhibition of the dissolution process.
Stir the solution every 5 minutes after the pill has been added to see how long it will take to dissolve in your body. The reason it should take so long is because the nutrients need to finish dissolving in the small intestine to be absorbed correctly. If it takes less than 25 minutes it is not doing you much good.