Flint 1760The EVGA warranty does not cover water damage at all. Your home owners or rental insurance might. Was the GPU and your system running at the time? If not, you can take them apart and dry them. You'll have to redo the TIM and probably the pads. They have to be absolutely dry so it may take three to four days in a dry/low humidity environment. If you don't want to disassemble the cards, not advised, do the same as above and extend your drying time a lot.
ty_ger07If you wait days for it to dry, that's also days of allowing it to rust or corrode. If you can accelerate the drying time by taking it apart and bathing/agitating/rinsing it in high purity alcohol, the chances of it surviving increase. Otherwise, all the liquid trapped under BGA chips (like the GPU core and memory) and any other small components, are likely to corrode and repair can be essentially unfeasible.