No, CS do not include drink in the meal - they are separate.
There are plenty of higher priced CS restaurants - Be our guest breakfast or lunch, chicken and/or rib meals at various locations (Cosmic Rays, Flame Tree BBQ), Wolfgang Puck Express in Disney Springs are some... I am sure there are others... all of these are CS options that will run you more than $10-13 for a meal. I'm sure there are more. If you plan to eat at the heavier CS locations and you utilize the dessert credits for sides (ie at Flame Tree you can get the onion rings instead of dessert making it a very sharable meal for two) then you can save a bit. If you just want to eat where you want to eat and what you want to eat and won't get desserts (at some places they are quite nice, like specialty cupcakes... at others they are very generic like prepackaged chocolate cake) then it is not a good value. If you get a kick out of working the plan to its fullest you can save some money.
For example say you are spending the day at MK and go to BoG for Lunch and Cosmic Ray for dinner -
$2.99 drink
braised pork or roast beef sandwich = $16.99
cupcake for dessert = $5
OR swap cupcake for soup $5.99
with soup instead of cupcake you're at $27.66 for lunch with tax
Columbia Harbor House dinner
$2.99 drink
grilled salmon with couscous and broccoli $12.49
seasonal cobbler for dessert $4.29
$21.06 with tax
another $5 on average for a snack and you're about $54 for the day. IMO you have to work too hard for that little bit of savings, i'd rather just order what I want
