I feel it depends on the plastic- PET#1 (thin bottles referred to above) versus HDPE#2 (milky jug referred to above) versus LDPE#4 (I think Gatorade uses #4?)- all have different reactions to different liquids, in my opinion.............
But I would love to see real evidence on the plastic leaching into the water ongoing debate.  I can't find anything- this came up on another thread and it seemed we could find no empirical data.  I thought it had been debunked.  I seem to always find only data that states the opposite- it is the quality of the fluid, not the container, in most cases, right?
Snopes says no? 
Debunked? On the other hand- John Hopkins- 
BPA I still feel safe!  Not!