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Yes, using water when drilling concrete can help keep dust from clogging the hole and prevent your drill bit from wearing out, although you don’t need to spray water on the concrete while drilling. Water can also lubricate the bit and help keep it cool since drilling into concrete can generate a lot of friction and heat. 

Most standard concrete patios are around 4 inches deep. However, concrete patios that need to support very heavy items, like a hot tub or outdoor kitchen, should be around 6 inches thick to support the full weight of these items. You'll also want to make sure you install rebar for patios that need to support a lot of weight like this.

A concrete floor is just an indoor finished surface on a concrete slab, which a local concrete flooring company will polish or coat for aesthetics and stain resistance. A concrete slab is more often an unfinished slab of concrete that serves as a foundation for a structure, like a shed or home. However, they can also be finished for outdoor use, as in the case of a decorative concrete patio or walkway.

Costs depend on the extent, the material choice, labor, and any decorative finishes requested.