If you want to eat on your own, Liptovský Mikuláš is a good place to do so. There are plenty of grocery stores and small supermarkets where you can also pay by card.
Food delivery in Liptovský Mikuláš is offered by many restaurants. For example, pizza delivery in Liptovský Mikuláš is a common thing. Pay attention to Pizza Boma and Pizza Hurikán.European and Eastern European cuisine is most popular. Sushi delivery, Chinese food and Thai food are not too popular in Liptovský Mikuláš, it is difficult to find these foods.
Some hotels offer sushi on their restaurant menus, but this is more of an exception to the rule. Don't be disheartened, you'll love the gourmet and healthy food you'll find here.