As a compounding pharmacist I have a bit of experience with masking lousy tasting medicine. If you can be a bit more specific I may be able to help you make it more palatable for you.
If it is a bitter taste, then try mixing it with flavors that have a natural bitter element inherent in them, such as coffee, grapefruit, chocolate, or wild cherry. If it is a true 'bark' taste then perhaps mixing it with merlot may help, or it may simply ruin a good merlot......
Hope that this helps.