A bottle of water 😄
But it really depends on what you think is a good deal.
2 20oz bottles of coke for 2 Dollars. That's 40oz of a product.
1 24oz of Monster for $2.50. That's 16oz less for .50 cents more.
Therefore, money wise. Coke is the better deal.
But energy wise, I can honestly say that in my opinion, Monster always jolts me up better than Coke.
So if you need energy, Monster.