This is the actual list of "Must Haves" for each, according to Business Insider ...

Blake Shelton's rider items: 

1 bag Dunkin Donuts coffee
1 bag espresso blend (Starbucks)
1 4 Pack of 5 Hour Energy
1 Case of Bud Light (cans only)
1 Case of Miller Lite (cans only)
2 Bottles of Bacardi Clear Rum
2 Bottles of red wine (Cabernet Sauvignon)
3 3-packs of Blue Orbitz gum
1 package of peppered or teriyaki beef jerky
1 bag of Hershey's Chocolate Minis

Taylor Swift's rider items: 

If arriving before 11 a.m., the following from Starbucks:

1 Grande ICED Caramel Latte w/ 2 sweet-n-lows
1 Grande ICED Americano w/ 2 sweet-n-lows with soy milk
1 slice pumpkin loaf

1 Stick Butter
3 Boxes Kraft Macaroni/Cheese
2 Four Packs of Red Bull
1 12 Pack Corona Beer
1 12 Pack New Castle Beer
1 Bottle Welch's Grape Juice
1 Avocado
1 Bag of Twizzlers red licorice
1 Case of Smart Water
1 Pint Ben & Jerry's Chocolate Chip Cookie Dough Ice Cream
1 Pint Ben & Jerry's Chocolate Brownie Frozen Yogurt