Planning a homebirth here too, but I packed snacks last time for my hospital VBAC. If I was going to a hospital this time, I would do the same. Only thing is that I've become so militant, that I might not be sneaking
If someone "catches" you eating, you could always say, "I'll take your suggestion under advisement." and continue doing what you think your body is telling you to.
The reason they don't want you eating (which I'm sure you know) is that they don't want you to aspirate in the event that they need to do an emergency section. My argument is that I would rather have food that might stay in my stomach than to aspirate plain, old, stomach acid which would burn my lungs. I just found out that at our local hospital they don't all ANY mamas to eat during labor. I think that's sad.
If you stay home as long as you can before you go in, you can eat and drink at will without having to sneak. By the time you go in, you probably won't feel like eating anyway. KWIM?
I wish you well on your VBAC by the way!!!!