In a large saucepan, bring water, lemons, sugar and raisins (or grape juice) to a boil. Turn off the heat and stir to dissolve the sugar. (If using a narrow neck fermenter, juice the zest the lemons instead of slicing, discarding the rind).
Allow the mixture to cool before pouring everything (lemons included) into a primary fermentation vessel.
Add the yeast nutrient, pectic enzyme and wine yeast. Stir to incorporate, and allow the mixture to ferment for 7 to 10 days.
After primary fermentation, rack the wine into a secondary fermenter using a sterilized siphon. Ferment for about 6 - 8 weeks in secondary, until fermentation stops and the wine clears.
Bottle the lemon wine in corked wine bottles, and allow the mixture to age for at least 3 months before drinking.
Notes
This recipe can be increased to make a 5 gallon batch, or decreased to make a small one quart batch using a mason jar fermentation kit.