Cabernet Sauvignon (From Kit)

Equipment Required

• Primary fermenter (food-grade bucket, 7.9 gallon)
• Glass carboy (6 gallon) for secondary fermentation
• Airlock and bung
• Auto-siphon and tubing (for racking)
• Hydrometer
• Sanitizer (potassium metabisulfite or Star San)
• Wine bottles, corks, and corker

Ingredients

• 1 Cabernet Sauvignon wine kit (6-gallon / 23-liter size)
• Kit includes: concentrated grape juice, yeast, bentonite, potassium metabisulfite, potassium sorbate, isinglass or chitosan clarifier, oak chips or powder
• 6 gallons filtered water (chlorine-free — use carbon-filtered or spring water)
• Sanitizer (Star San or potassium metabisulfite solution)
• 30 wine bottles, corks, and a corker

Method

1. Sanitize and prepare. Clean and sanitize your primary fermenter, spoon, hydrometer, and all equipment. Dissolve the bentonite (a clay fining agent) in warm water and add it to the primary fermenter — bentonite binds to proteins and helps clarify the wine during fermentation. This goes in first, before the juice.

2. Add juice and water. Pour the concentrated grape juice into the fermenter on top of the bentonite. Rinse the juice bag with warm water to extract every drop. Add filtered water to reach the 6-gallon (23-liter) mark. Stir vigorously for 2 minutes to mix and aerate. Take a hydrometer reading — your starting Specific Gravity (SG) should be 1.080–1.090, which predicts a finished wine of 11–13% ABV.

3. Pitch yeast. Sprinkle the kit yeast on top of the must (unfermented grape juice is called "must"). Do not stir it in — let it rehydrate on the surface for 15 minutes, then gently stir. Seal the fermenter with an airlock. Primary fermentation begins within 12–24 hours.

4. Primary fermentation (5–7 days). Ferment at 68–75°F. Stir gently once daily to keep yeast in suspension. After 5–7 days, check SG — when it drops to 1.010 or below, it is time to rack to secondary. Primary fermentation is vigorous: yeast is consuming sugar rapidly, producing alcohol, CO2, and heat.

5. Rack to secondary. Siphon (rack) the wine off the sediment (lees) into a sanitized carboy. Attach an airlock. Add oak chips if included in your kit — oak contributes vanillin, tannin, and complexity. Secondary fermentation is slower and quieter. The wine is finishing the last sugars and beginning to clarify. Leave for 10–14 days. Target SG: 0.996 or below (dry wine).

6. Stabilize and fine. Add potassium metabisulfite (prevents oxidation and microbial spoilage) and potassium sorbate (prevents refermentation in the bottle). Add the clarifying agent (isinglass or chitosan). Stir vigorously for 2 minutes to degas the wine — dissolved CO2 must be removed or the wine will be slightly fizzy. Degas again the next day.

7. Clear and bottle. Allow the wine to clear for 2–4 weeks in the carboy. The wine should be brilliantly clear with a firm sediment layer on the bottom. Rack one final time into a clean vessel, then siphon into sanitized bottles and cork. Store bottles upright for 3 days (to let the cork set), then on their sides.

What You're Practicing

Wine making teaches you patience and process — unlike beer, wine ferments slowly and rewards aging. You are learning the difference between primary and secondary fermentation: primary is fast and aerobic-tolerant, secondary is slow and must be protected from oxygen. Racking teaches you about lees management — dead yeast and grape solids that can produce off-flavors (hydrogen sulfide) if left in contact too long. The stabilization step introduces sulfite chemistry — SO2 binds to acetaldehyde and inhibits wild yeast and bacteria. Degassing demonstrates that CO2 solubility decreases as alcohol increases. The hydrometer readings connect to the same gravity science used in brewing (see Fermentation Science). Wine kits are an excellent training ground because they isolate the fermentation process from the complexity of working with fresh fruit.