What law? The law that permits death by starvation? You can't break a law that is null and void. The situation is analogous to slavery. The Dred Scott decision was null and void. There is a law higher than the Supreme Court.
Regardless, even by Constitutional standards the Supreme Court was intended to be the weakest branch of government. I don't see any problem with Bush telling the courts to try to enforce their decision.
Then if you are going to ask him to take that risk, you should be willing to take that risk as well. If you want President Bush to break the law, than you should be willing to do so as well. Let us know when you get to Florida, if you get arrested for trying to give her food and water, just explain the law to them that you just explained to me. I'm sure they'll understand.
The President has no authority to determine which laws he will follow and which laws he will not. If he undertakes any action because he believes the court order starving Terri Schiavo is immoral, then he will be acting as a private citizen. As such, it is clear that you believe this law to be immoral. So, I ask again, why are you relying on President Bush to do something outside of his Constitutional authority. Why don't you go insert Terri Schiavo's feeding tube yourself?
If the order is null and void under natural law, then you should have no problem breaking whatever laws are necessary yourself to get the feeding tube inserted.