Self-reliance is a myth. In every category, there will always be much that you do not know or understand. For every piece of information you know or believe, at some point you will have to take more on either credibility or faith.
It is the same with everyone. We all accept things on either credibility or faith.
The water bottle was a great idea, but it needs some help to stay cold all day. Fill it about halfway and lay it on its side in the freezer overnight. Fill it before you walk out the door the next morning and it will stay cold all day.