If you liked the taste of Pepsi, try Wal-Mart's store brand of cola. It's very close. And whatever you think of Wal-Mart itself, I'd bet their (US-made) cola is not manufactured by some eeeeeeeeevil multinational conglomerate.
Yup. Diet Pepsi is my favorite soft drink drink of all time, but I actually prefer Diet Sam's Choice to Diet Coke. Sam's Choice also tastes delicious with a bit of vanilla extract mixed in. They used to sell sugar-free raspberry syrup specifically for mixing in colas... mixed with vanilla extract... it was bliss. Not being produced anymore though. :-(