Papike,
As mentioned by Gswager, your attendant can and should bring you your meals if you ask him/her to do so. I recall in your other post that you mentioned a disability, and now I note that you don't do steps well. However, this is a single level train, there are no steps between your room and the dining car. It is a single level train and there is no need for you to climb any steps to reach the rest of the train.
Now if you are unsteady on your feet, well then walking down the hall on a bouncing, bucking train may not be something that you want to attempt. However, if normal walking isn't too big of a deal for you, then you may want to try heading for the dining car at least once, just for the experience. Odds are that your food will also be a bit warmer, and except for liquor, refills are free. In your room, there won't be any refills.
If you do opt for delivered meals at any point, I would suggest that you tip your attendant extra for that service. Also be sure to arrange things with them well ahead of meal time and understand that they do have many other duties and possible a few other's in the car who might also be requesting meals in the room.
Now all that said, boarding in Philly will not be a problem, as Philly has high-level platforms, so you'll just need to step across the small gap between the platform and the car.
However, Orlando does not have high-level platforms. There you will need to climb down about 4 steps to reach the ground. If you think that this will be a problem for you, then mention this to your car attendant. That way he/she can have the conductor arrange for a lift to be in place at your car when the train reaches Orlando.
Finally, I'm going to move this topic to the Amtrak forum, as it's currently in the Trip reports forum, which is where people report on trips already taken.