Generally, in "slip and fall" cases like this, the store is responsible if the store employees knew or should have known about the danger and did not take steps to fix it.  If the floor became wet just before the accident and store employees had no time to clean it or post adequate warning signs, the store is likely not responsible.  But if the floor was wet for a while and store employees knew or should have known about it but did not do anything, you have a good case.

James Lee Katz, Attorney at Law, helps victims injured in car accidents, work accidents and diseases, personal injury accidents, and wrongful death accidents, across the Baltimore, Maryland area, including:
Baltimore City, Baltimore County, Towson, Owings Mills, Carroll County, Westminster, Sykesville, Howard County, Columbia, Ellicott City, Anne Arundel County, Glen Burnie, Frederick County, Washington County, Prince George's County, Harford County, Cecil County, and Montgomery County.