It’s okay if you have an unproductive day where all you do is the errands. It could be very frustrating if you keep thinking about it as a waste so it’s better to think of it as a break, an unplanned break and it will relax you.
But at the same time keep track of it because it’s good to have a break over a week but doing it more often wouldn’t be beneficial. Planning is good but it’s okay to let the plan slip for one day.
A good thing about an unproductive day is that you can always start over fresh next day onwards.