There's a completely different kind of meal voucher that's available at the Animal Kingdom. When we went in January they were $11.99 for adults and $5.99 for children, if I remember correctly. You can use them at the counter service restaurants for lunch in AK, and the adult certificate entitles you to a meal + a beverage, as well as another beverage and a snack (ice cream bar or popcorn) that you can redeem later in the day. The vouchers are available at the restaurants. (Tusker House, Flame Tree, Pizzafari and maybe Restaurantosaurus)
So, for example if you went to Flame Tree for lunch you could order the rib plate (1/2 rack of ribs with baked beans and 1/2 corn on the cob) for $8.49 and a bottled water for $2.50. So you would have spent 11.00 or so without the voucher, BUT you still get another botled water ($2.50) and popcorn ($2.50 or so) with the voucher. Just make sure you get your snack before the carts all shut down for the day!
As far as I know they're still doing this at AK.