Check for voltage at the starter solenoid while someone tries to start the car. If not present, check for loose/corroded primary connections, bad or soaked main relay, and worn/damaged contacts in ignition switch.
If the lights come on when you turn on the ignition, do they go off while you are trying to run the starter? This should normally happen, to relieve unneeded loads on the battery while the starter runs. If not this would point to ignition switch or relay.
You could also measure the voltage at the battery while someone tries to start the car. The voltage should drop from about 12 (with ignition on, not trying to start) to somewhere between 8 and 10 volts if the starter motor is drawing a normal amount of current. If the voltage drop happens but the starter does not work it is probably locked and needs to be replaced. If no drop, see first paragraph. If the voltage drops to much below 8 volts then your battery is not well enough charged (or the starter has a partial short circuit). Can you get the car to run with a jump start from another car? If so it points to battery and/or charging system.
It might not be related to the water you drove through. But especially if the car can be successfully jump started, check the charging voltage to see if the alternator/regulator got damaged. Maybe you limped home on residual charge in the battery.
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