Just to be the odd man out:
Leaving the bottle unrefrigerated may be considered foreseeable misuse. The label's failure to warn of the potential consequences of leaving the bottle unrefrigerated may be an inadequate warning.
I recall a case in my Products Liability class where the label stated "may be harmful if swallowed", but failed to indicate that small amounts would almost certainly cause death to infants, and was considered defective labeling because of the lack of a proper warning.
In this case, it can be argued that a reasonable person would believe the product should be refrigerated to keep it fresh, and failure to do so would only result in the product spoiling, not exploding.
Write a letter to the manufacturer indicating what happened, why you think it should not have happened, and what you want them to do about it.