the war between milk and cereal is a series of small skirmishes, not a big epic battle. a little cereal, a little milk. a little more cereal to finish off the milk. a little more milk because you put in too much cereal. and repeat until either the box or the jug is empty.
You know what I do? Pour a bowl of milk and then only add in a couple spoonfuls of cereal at a time. No risk of sogginess and no concerns about the ratios.