STYLETHREAD -- LET'S TALK SHOP!

if you can eat fructose, you can go with fruit.
If you can't eat fructose either, most vegetables should be fine, except than the very starchy ones: potatoes squash and relatives.
as for drinks, you can have herbal teas, like chamomille or other stuff; they have them at most supermarkets, check that they say "caffeine free"
you can probably eat cheese and fish too. And eggs.
There is plenty of stuff you can have, I think...

hth