When going out, one must bring money; otherwise, it is difficult to get anywhere.
This is the most basic common sense for anyone, and anyone over the age of 10 would remember this clearly.
However, not everyone among the crowds has mastered even this fundamental principle of life. In addition to the disabled and those who have stayed at home for decades, there are also some royals and nobles who have never experienced a lack of money or hunger and have thus missed the concept of "carrying money when going out and carry enough of it."
Unfortunately, Princess Minerva is one of them.
For the princess who has never paid for anything with her own hands, not having money to buy even black bread and clean water is just pure book knowledge. Due to her hurried departure, she made the mistake of only carrying enough funds to pay for the smuggling boat fare and one day's worth of meals.