Drain the oil, new filter, new airfilter. Dissy cap off and check in there for water. It should drain out the bottom though.

If there's any chance water got in the fuel tank, that needs cleaning out too. Kjet is just the last place on earth you want to get water. You can pump the tank out through the feed line under the bonnet and jump the fuel pump relay to have it run with the engine off.

New fuel filter too. Just not worth the trouble it can cause not to replace all the filters.

Gavin