2013 Honda Civic LX 4Dr driven through water, next day it won't start, no click/ no crank, Any thoughts or advise would be so appreciated?

My husband drove our 2013 Honda Civic LX 4Dr sedan (1.8liter engine) through some standing water(he was forced to because all entrances to our apartment complex were flooded) during a rainstorm the other night. The next day it wouldn't start, no click & no crank but the radio, heat and lights work( and aren't dim). I know we should take it to a mechanic and that is what we will do but we're hoping to try some things at home to get it started so we don't have to get it towed.

warning lights when the key is turned: Low oil pressure indicator, Charging system indicator, EPS, and the Malfunction indicator lamp blinks.
Battery seems ok

Probably sucked-up some water into the engine. Pull to spark plugs out & turn-it-over a few times to get the water out of it, & put in a NEW air cleaner…

Check the starter system connections. Some elements can be dried with a hair dryer. You may have soaked something like the starter solenoid or voltage regulator.

Since water and electricity don't mix, check your Fuses and Fusible Links. Some are good because the clicks are Relays working. If your Headlights work, put them ON and try to Start it. If the lights go out you have a loose connection to the Battery, Starter or Ground. If nothing happens you have an Open Circuit, If the Headlights are not Bright you know the Battery is Discharged and you have to Charge it before it will Crank or Start.

That blinking check engine light does not sound good. Check the trouble codes first.