I recently went through this same thing with my JW-wanna-be buddy.
She pointed to Acts 15 also. Here is a condensed response that I gave her:
Based on the context of Acts 15 (specifically Acts 15:9-11), isn't it made clear that salvation is entirely based on "faith" through "the grace of the Lord Jesus"? Is salvation by any other way, or the loss of salvation, mentioned anywhere in Acts 15? Doesn't Acts 15 deal with the issues of fellowship between the Jews and the Gentiles? Where in Acts 15 does it imply the loss of salvation due to how you respond to the blood instruction? How do you come to that conclusion from these verses?
In Deut. 14:21, Jehovah clearly forbids Israel to eat a body that is already dead, yet in Lev. 17:15, He instructs them on what procedures to take if they DO eat something dead. Doesn't it makes sense from this, that Jehovah has a higher regard for human life, than blood instruction? He made allowances so that in time of famine, they could choose life, rather than die of starvation, because they could not properly bleed their meat.
After I asked this, the subject was dropped and no reply. I let it go. The seed is planted. No response is a good sign, as I have found. The blood doctrine was the thing that put my red flags up. That was when I found the WTS to be something other than what it tries to portray itself as. Where is the love in DF people on their death beds, because they choose to have a blood transfusion? Convincing a parent that they must let their child die. That is sacrificing a human life, and God is quite clear on that throughout the Bible. He finds that detestable.
I also pointed out many things in the "Can Blood Save Your Life?" publication. I know it made her think. She asked her JW gurus, and they had no idea how to respond. I just thank God for the opportunity to give them all some food for thought. I hope He leads them all out of the WTS and into the arms of Christ!