A litre (or liter) is a measure of volume, not a measure of weight. A single liter of milk weighs ABOUT 1.03 kilograms.
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A milk carton with 1L of milk
With a ratio of 2:1 there are 2 + 1 = 3 parts.Therefore 1 part of 90 litres is 90 litres ÷ 3 = 30 litres.Thus the mixture currently contains:2 parts milk → 2 × 30 litres = 60 litres of milk; and1 part water → 1 × 30 litres = 30 litres of water.The final mixture has 1 part milk to 2 parts water.This time the mixture contains 1 part of milk = 60 litres as calculated above (adding water does not change the volume of milk in the mixture, just the ratio of milk:water).Thus the amount of water in the final mixture is 2 parts = 2 × 60 litres = 120 litres.There is already 30 litres of water (as calculated above), so 120 litres - 30 litres = 90 litres of water needs to be added to the original mixture with a ratio of 2:1 to get the final mixture with a ratio of 1:2.90 litres of water needs to be added.
1000kgs = 971.13 litres
If you're looking at a list of choices, I can't help you pick the best choice from the list because you're not sharing it. My estimate, without even seeing the small carton of milk, is 1 cup (8 fluid ounces, 1/2 pint).
59 litres = 5,900 cc 5,900 / 8 = 737.5 cc