Caleb MorganBy Caleb Morgan

Updated November 2026

The rj spagnols cru international california moscato wine making kit is a concentrate-based kit designed to take a home winemaker from a box of ingredients to bottled, sparkling-style moscato in a few weeks. This guide walks through the brew day steps, the equipment you need on hand, and the mistakes that most often spoil a batch. Follow the sequence below and you should end up with a light, fruit-forward white that is ready to chill and serve.

What You Need Before You Start

Kits like this one are built around a juice concentrate and a yeast packet, but they assume you already have the basic gear. Gather everything before you open the box so you are not hunting for a siphon halfway through transfer.

Shopping for one? See our guide: 5 Best Moscato Wine Making Kit Options for Home Winemakers (2026).

  • A food-grade fermenting bucket with a lid and airlock
  • A hydrometer and test jar
  • A auto-siphon and length of tubing
  • A no-rinse sanitizer such as a sodium metabisulfite or iodophor solution
  • Bottles, corks or caps, and a bottle filler
  • A large measuring vessel and a clean stirring spoon

Check that the kit’s contents match the packing list before you start. If something is missing, you can often pick it up from a homebrew shop before the must goes into the fermenter.

Step 1: Sanitize and Prepare the Must

Sanitation is the step beginners skip most often, and it is the one that matters most. Soak every piece of equipment that touches the wine, including the lid, airlock, spoon and hydrometer, in your sanitizer solution. Mix the concentrate with warm water to the volume the instructions specify, then stir until it is fully dissolved.

Take a specific gravity reading with the hydrometer before adding yeast. The reading should fall in the range listed in your kit’s instructions. Record it, because you will compare it to the final reading to estimate alcohol content.

Step 2: Pitch the Yeast and Start Fermentation

Once the must is at the right temperature, sprinkle the yeast over the surface or rehydrate it first if the packet directs you to. Seal the bucket, fit the airlock partly filled with water or sanitizer, and move it somewhere with a steady temperature, away from direct sun. Bubbling in the airlock usually begins within a day or two. A slow start is normal and not a sign of failure.

Keep the fermenter out of drafts and avoid moving it while it is actively bubbling. Temperature swings can stress the yeast and leave off-flavors in the finished wine.

Step 3: Rack, Stabilize and Bottle

When the airlock slows to a bubble every minute or more, take a second gravity reading. If two readings a few days apart match, fermentation is finished. Rack the wine off the sediment into a clean vessel using your auto-siphon, leaving the lees behind.

Moscato is sweet by style, so stabilizing matters. Follow the kit’s directions for adding potassium sorbate and sulfite before backsweetening, or the residual sugar may restart fermentation in the bottle. Once stable and clear, bottle with a fill height that leaves a small headspace, cork or cap, then store upright for a few days before laying the bottles down.

Common Mistakes to Avoid

  • Skipping sanitation or using a rinse-required cleaner on a surface you never rinse
  • Bottling before fermentation is truly finished, which can cause bottles to burst
  • Backsweetening without stabilizing first, leading to fizzy or re-fermenting wine
  • Letting the fermenter run too warm, which can produce harsh, solventy notes
  • Ignoring the hydrometer and bottling on a timer instead of on readings

A reliable auto-siphon makes racking much cleaner and reduces the risk of splashing oxygen into the wine. View on Amazon

A glass or plastic hydrometer with a test jar lets you track sugar drop and confirm when fermentation has finished. View on Amazon

A no-rinse sanitizer saves time on brew day and keeps your equipment consistent between batches. View on Amazon

FAQ

How long does the rj spagnols cru international california moscato wine making kit take from start to finish?

Most moscato kits take several weeks from pitching yeast to bottling, followed by additional time in the bottle before serving. Check the kit’s timeline, since fermentation speed depends on temperature.

Do I need to age this moscato before drinking it?

Moscato is usually best young and fresh, so a short rest of a few weeks after bottling is typically enough. Aging for long periods tends to mute the fruit character.

Can I use this kit without a hydrometer?

You can, but you lose the ability to confirm fermentation is complete before bottling. A hydrometer is strongly recommended to avoid over-pressurized or unstable bottles. Consult your kit’s instructions for any further safety guidance.

Conclusion

The rj spagnols cru international california moscato wine making kit rewards careful sanitation, patience during fermentation and clean stabilizing before bottling. Keep notes on your gravity readings and temperatures so you can repeat a good batch or fix a problem next time. Work through the steps in order and your first bottle should be a crisp, enjoyable moscato.

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Caleb Morgan

About Caleb Morgan

Caleb Morgan is part of our editorial team and reviews and edits our home brewing guides, checking product details against manufacturer specifications and owner feedback.