Actually, the Water Preserver Concentrate that we sell comes in bottles that treat 55 gallons at a time. Our listing is for three of those 55-gallon bottles. So first, I would check to see that, if you used one bottle that it indeed is intended to treat 165 gallons.
If you need to purchase a single 55-gallon-treatment bottle, email me
and I will sell you just the one bottle.
Is it critical to get the proper ratio (water to concentrate)? Well, I'd just say that since clean drinking water is the most critical need in a survival situation, the prudent approach would be to store your water with the best-possible means and conditions.