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.
The most commonly injected drugs found in pills (i.e. oxycodone, hydromorphone, morphine, oxymorphone[2]) are water soluble and it takes no heat to get them to dissolve into the water. In fact, some of the modern pills contain abuse deterrent mechanisms in which the solution will turn into a gel when heat is added.[3]