Day 0 - 28.5 bottles vs. 31.5 bottles
The old Italian glass carboy(smooth side) is ~30.3 bottles, the 'new' Mexican glass carboy(side square pattern) is ~31.7 bottles. Production on the Mexican ones stopped April 08, nobody knows what will happen.|
When u follow manufacturers' instructions, i.e. starting with 23 litre total, u'll get ~28.5 bottles in the end. Not 30 bottles, due to wine loss during siphons.
For those of u who don't mind lighter wine, u can add a bit extra water on day 0. On some of my expensive + heavier wine, I start with ~23 +1 litre. After primary, I siphon it into 1 Italian + 1.5 litre wine bottles, leaving lots of space in secondary = making sure they don't bubble out of containers. At the end, I don't need to look around for wine to top up for bulk age. Getting 30 bottles + little for tasting.
Summer is coming, u might be able to get away with a little lighter wine.