The instructions for the Chocolate Raspberry Port I did last fall has the following in the instructions:
"Note: If you are bottling at this time you must remove the bung and airlock and replace them with a solid rubber or silicon bung. This will help to prevent oxidation until you do bottle. If you intend to leave the wine in the carboy longer than one month, you will need to top it up to within 2 inches....."
It also states the following:
"Note: Winexpert kits contain very low levels of sulphites as compared to commercial wine. If you want to age your wine more than 6 months, you must add extra metabisulphite powder to prevent oxidation...."
But, the Raspberry-Peach Sangria did not have this information in the instructions. So it appears they give you this information for some kits and not for others.....