How many times should i drink a 500ml bottle of water to reach 8 glasses a day? i hope you get what i mean any health experts there pls answer

The "eight glasses a day" rule presumes 8-oz glasses:

8 x 8 = 64 oz = 2 quarts

1 quart = 946 ml x 2 = 1892 ml

So you should drink 3.784 of those 500ml bottles of water.

Looked at another way, each of those 8oz glasses of water holds 236.5 ml, so if you drink all four 500ml bottles of water, you're drinking a little more than 8 1/2 glasses of water.

Looked at a third way, if you measure an extra half-ounce of water into each of your eight glasses, you're up to four 500ml bottles.