Fit a funnel with a mesh sieve into the neck of a sterilized carboy. You can also use a special brewing funnel with a strainer if you choose. Using a large ladle, scoop out the peach pieces and pour them through the sieve and funnel.
Press the peach pieces into the sieve to get as much of the early wine out as possible.
When the sieve fills up, dump the spent must into the compost, and replace. Keep repeating until the majority of the fruit is out of the wine.
Pour the remainder of the wine through the sieve and funnel.
You want the wine to come to the bottom of the neck of the carboy. If you have too much, you can pour yourself a glass of not-yet-finished-but-still-delicious wine. If you have too little, you can top it off with more non-chlorinated water.
Fit the carboy with an airlock. All this agitation will restart any sluggish fermentation quite actively, so I recommend placing the carboy in a place where you can keep an eye on it easily (but still out of direct sunlight).
Once you know it’s not going to geyser wine everywhere, you can then move the carboy to a dark, out-of-the-way spot to do the longer secondary fermentation.
Secondary fermentation is complete when the wine is “still,” meaning there is no carbonation in the wine, no bubbling in the airlock, and the wine has cleared. This can take anywhere from a couple of weeks to months, depending on a number of factors. Do not bottle until the wine is still.