First, we convert 45 fluid ounces to milliliters. Since there are 33.8 fluid ounces in 1 liter, we have:

45 fluid ounces = 45/33.8 liters = 1.329 liters

Next, we convert 1.329 liters to milliliters:

1.329 liters = 1.329 * 1000 milliliters = 1329 milliliters

Since each bottle contains 200 milliliters, we divide the total milliliters by 200 to find the minimum number of bottles needed:

1329 milliliters / 200 milliliters = 6.645 bottles

Since we can't buy a fraction of a bottle, Christine needs to buy at least 7 bottles.

Therefore, the minimum number of bottles Christine needs to buy is $\boxed{7}$.The answer is: 7
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
To meet her milk requirements, Christine needs to purchase at least 45 fluid ounces from the store. The store only sells milk in 200 milliliter bottles. Knowing that there are 33.8 fluid ounces in 1 liter, what is the minimum number of bottles Christine needs to buy? (Calculator use is allowed for this problem.)

### Answer:
