You can take Lamisil with food or on an empty stomach. Even though the fungus may appear to go away sooner than 12 weeks (or 6 weeks for fingernail fungus), it is important that you take it for a full 12 weeks (6 weeks for fingernail fungus) to make sure that you kill each and every fungus cell.
Ceramic-tile floors can be cleaned easily with nothing but warm water, but be sure to sweep or vacuum first to remove any loose soil or grit. Never use a sponge mop to clean ceramic-tile floors. It will pull the dirt right into the grout tracks.
You can clean ceramic tile with just about any soap, but the more powerful ones often give you a better job. The tile and grout need to be free of all dirt, oil, grease, etc. for the paint to have a chance to bond. The best tile and grout cleaner I have ever used is Stain Solver certified organic oxygen bleach. It's Made in the USA with USA ingredients. This is a powder that you mix with hot tap water.