The numbers on Mr. Malty are scary here for someone who has not done any harvesting and re-pitching. Looking at your pic, you have about 1/2 cup of slurry or about 118mL, at 10%. Using those, Mr. Malty says you need 1034 mL for 5 gallons of 1.065. May need a couple steps. But Im sure someone with more re-pitching experience can allay those fears