Notice that the line divides each unit segment in 4 parts. Assuming that each part has the same length, then we know that each mark is equal to:

Count the amount of bottles on each mark and add the corresponding volumes to find the total volume of soda.
There are 2 bottles of soda at 1/4.
There is 1 bottle of soda at 3/4.
There is 1 bottle of soda at 4/4
There is 1 bottle of soda at 5/4
There are 2 bottles of soda at 6/4.
Add all the fractions to find the total volume:

Simplify the fraction 26/4, since both numerator and denominator are multiples of 2:

The fraction 13/2 represents the total volume of soda. Since that volume is re-distributed equally into the 7 bottles, divide 13/2 by 7 to find the volume that each bottle will have:

Therefore, 13/14 new flavor of soda was poured into each bottle.