To taste something bad, when you are dreaming, can be interpreted as symbolism of inability to strengthen or support yourself physically or mentally. Bad taste is sign that you need to put more energy in any efforts that you are going to make. On the other hand, there can be different explanation, the dream may be telling you to consider of what is causing this bad taste in your waking life.
Taste dream meaning
Read more about dreaming of Taste in other dream meanings interpretations.