Final answer:
Alicia should buy an equal number of bottles of each type of food.
Step-by-step explanation:
In order for the two types of food to last the same number of days, Alicia should buy an equal number of bottles of each food.
Let's say she wants the food to last for x days. Since the insects get two types of food every day, she needs to buy x bottles of each type of food.
So, the total number of bottles she should buy is 2x.