We plan on moving our two 330 gallon water totes into our garage to use for emergency water storage. Do we have to add anything to the water when we fill them up? We're on well water here. We've been using them to store water for the garden all summer, so they've been sitting out in the sun for months. I had planned on trying to clean them out with some bleach before we move them into the garage. We have a Berkey with Doulton super sterasyl filters to run the stored water through if it's ever needed.