Will we ever use Bitcoin for day by day use? Buy a bread, a phone, a car, an appartment?
Yes if you are living in a country or a community where most of the people are involved in crypto then chances of having day to day use with those things is possible.
Or Bitcoin will more likely be a way of just storing value and we have to rely on altcoins to use them daily?
When the value has reached the highest peak like $50,000 - $100,000 or more everyone will treat it as storing value but still transactions will exist.