Here is a link to help you. https://queenofclean.com/video-category/rubbing-alcohol-great-cleaner-disinfectant-laundry-spotter/
Altar, like church altar? What is the fiber content? What is spilled on it?
Alcantara, is that what you mean? That’s a hybrid synthetic suede. Here’s specific instructions. https://www.alcantara.com/en/stain_removal/39/index.do
If you are using it for cleaning purposes, you can just use tap water. Distilled water is simply water that has been distilled (like liquor) to remove all the minerals.