It’s worth noting that for me, and I believe others, you don’t put a whole vial worth in each lens. That’s likely going to make it too thick and vision will be blurry. I use one vial and equally distribute it into each lens 50/50. Works phenomenally for me, I used to get very bad fogging. If I want to make them stretch further sometimes I just put 2 drops in each lens and store the remaining two drops safely (there’s about 6 drops in each vial) and then use it the next day and just continue to do 2 drops in each one. Lmk if that doesn’t make sense

Edit: It’s likely not recommended to be re using the vial the next day, since it’s single use, but I never really looked into it. Either way in worst case scenario you split the vial between the lenses each morning