I think with $160 per day to spend on food it is totally possible to expect a TS mean and a CS meal each day, allowing about $20. per day for a full breakfast for 3 (2 adults and 1 child) at POP each day.
The $20 breakfast price is based on your having bought refillable mugs upon arrival at Pop.
For example: On your day at Epcot, you could eat a CS meal for lunch at Lotus Blossom Cafe and have...
Vegetarian Stir Fry w/ Steamed Rice $7.49
Orange Chicken w/ Steamed Rice $7.49
I order of egg rolls (2) $3.99
Child's Beijing BBQ Drumstick w/ Rice & applesauce $5.95
2 soft drinks $4.78
1 smoothie(for child) $3.99
Total $33.69 + tax
Dinner at Rose and Crown...
Vegetable Pot Pie $12.99
Fish and Chips $15.99
Potato and Leek Soup $4.99 (x 2 = $9.98)
Average Dessert $5.50 (x2 = $11.00)
Kid's Pick Meal $7.49 (this includes dessert for the child)
Total $57.45 + tax and tip
Your approximate total for your Epcot day, including tax and tip would be $135.00. This total includes the $20.00 I've averaged for a full breakfast at Pop.
The most expensive day I considered was your AK day eating lunch at Pizzafari and dinner at Rainforest cafe. Including breakfast at Pop, your approximate total still came in at just under the $160 mark ($158).
I also looked at 50's Prime Time for dinner and ABC Commisary (they seem to have a fair selection of vegetarian choices) for lunch on your MGM day. Including breakfast at Pop, your approximate total for the day was $145.
For MK, I considered lunch at Tony's Town Square and dinner at Columbia Harbour House. Approximate total for that day was $125, including breakfast at Pop.
This was fun. Hope you have a great trip!