Generally, if you need a certain volume of nutrient per gallon, you can stagger it in fourths. Start with 1/4 mixed in the must. Stir and add 1/4 after 24 hours, 48 hours, and when the mead is at it's 1/3 sugar break (has 1/3 of the gravity left, so when it hits 1.04 in your case). Adding it...