Final answer:
The cost of each bottle of water is zero dollars.
Step-by-step explanation:
The expression x+2x+5 is used to represent the amount Jaylin should pay for four bottles of water, two bags of cashews, and a fruit salad. Since the cost of the fruit salad is already given as five dollars, we can subtract that from the expression to find the total cost of the water and cashews. So, x+2x = 5 - 5 = 0.
Therefore, the cost of each bottle of water is zero dollars.