yes,will last for months unrefrigerated
c/p: from
http://www.aquavitro.com/support.html#fuel
Q: I just noticed that my bottle of fuel says to refrigerate after opening. Is my bottle bad since I have not done so?
A: It is perfectly fine to not refrigerate this product. Refrigeration is recommended if the product will be kept for several months. Depending on how long you will be using the bottle for, you may consider refrigerating it to keep the nutrients intact. If you will use up the bottle within only a couple months, you can just keep it at room temperature.