1. Drink more than three 300-milliliter bottles of water every day.

2. Drink over 0.5-milliliter of bottles of water a day.

3. Drink three 0.5-ml of bottles of water every day.

4. Drink three one-liter bottles of water a day.
(Can we use all the expressions?)

1. 3 * 300ml = 3 * .3 liters = .9 liters

2 and 3 are even less, but 2 = .005 liters, 3 = .015 liters

4. is a possibility, but that is too much water.

It would be better to express all in liters, but you would want them to drink more than .0015 liters a day.

PsyDAG is right about the amounts of water. Try these:

Drink more than three half-liter bottles of water a day.

Drink more than two liters of water a day.

The simpler you can make the phrasing, the easier it will be for others to understand.

Yes, all the expressions are interchangeable and can be used to convey the same meaning.

1. To calculate the total amount of water consumed in a day when drinking more than three 300-milliliter bottles of water, simply multiply the number of bottles by the volume of each bottle. So, if you drink three 300-milliliter bottles, you would consume 900 milliliters of water in a day.

2. When drinking over 0.5-milliliter of bottles of water a day, you are referring to any amount of water greater than 0.5 milliliters. This can be any volume, such as 1 milliliter, 100 milliliters, or even several liters.

3. If you drink three 0.5-ml bottles of water every day, you would consume a total of 1.5 milliliters in a day.

4. Drinking three one-liter bottles of water a day means you would consume a total of 3 liters of water in a day. This is valid because there are 1000 milliliters in a liter.