Welcome to cruise-chat, Andrei.
No, the price of the soda package is per person. It's also the policy of cruise-chat to not provide ways to circumvent shipboard policy, so we will leave it at that.
I agree that the packages are expensive. One has to really drink a lot of soda to make it worthwhile. There's no need to buy any package - just buy soda in individual glasses or cans. I've always done it that way.