TEN TOP SHOP VACUUMS, TESTED. I can tell you from experience that you want a wet-dry vac. You may not need it for years, but when you do . . . .

Also, know where your water shutoff is. And the gas and electrical ones, too. And have the shutoff tools handy . . . .

UPDATE: Charles Glasser writes: “FWIW on wet/dry vacs: during Hurricane Sandy I had a generator, but the electric sump pump couldn’t keep up with the rising water table. My 20 gallon wet vac helped as an auxiliary sump pump. Kind of MacGyverish but hey, no flooding!” You say “kind of MacGyverish” like it’s a bad thing!