Our water heater blew a leak. What should I do now?
I would file a claim with your homeowner's insurance agency; you may be looking at a lot more than $1,500 worth of damage if you pay it out-of-pocket. That water-damaged drywall can grow mold with its paper facings. So can the MDF core of the laminate flooring if you don't dry it out and remove it ASAP. Same with the plywood and the (presumably but hopefully not) wood sill plates and studs that comprise the walls that the water infiltrated to get into the living room, bedroom, and garage.

Even if you don't file a claim, I would take potential mold problems very, very seriously. Same with termites. Pooled water + construction lumber = terrible terrible badness.

When you say a "concrete slab home," does that mean slab-on-grade foundation or monolithic concrete construction, i.e. with ICFs? If the latter, then first of all congratulations, and second of all, your home's structure is probably okay. But you will still need to replace anything cellulose-based, including drywall due to its paper facings. The laminate padding is probably some type of foam so that may be salvageable.