In a bowl, combine the warm water and the raisins. Set aside.
In the slow cooker bowl, add the oats, eggnog, water, syrup, nutmeg, and vanilla. Stir well
Cook on low for 4 – 5 hours.
After soaking the raisins for one hour, drain the liquid. Add them to the slow cooker bowl 1 hour before cooking time is complete for the oats.
Please check the oats at the 4 hour mark if you prefer the oats with still a bit of texture to them, or if you like them much softer, let them continue to cook.
When cooking time is complete, serve with a drizzle of milk or cream.
Alternative: Instead of soaking the raisins in water, try soaking them in a good quality dark rum!