Lagi - as far as I remember, being blood stained or salty is just cosmetic. There are liquids which can harm you though - I distinctly remember one place where you can fly down which has harmful tiles.
you mean Rusty Wells, east from Joppa?
There is deep salty water at the bottom. Game make a prompt "do you really want to get there?" but water, have absolutly no impact on anything. You will get wet only (not sure if salty too). It doesnt affect equipment, HP, nothing gameplay wise. Which is a BIG decline, from old ADOM where water were deadly (probably even too much).
And honestly in RealLife(tm) water is a big pain. If you get wet you move slower, you can get sick, you get blisters on your feet, you can freeze, your food get spoiled (all electronics - cybernetics i would presume too, who will make them waterproof in post apo?). And i mean not deep water (you shouldnt be able to swim with 300pounds of backpack, heavy armor, and weapons in both hands anyway).
.... and salty water?! huh... try to walk 1 day with clothes soaked in salty water, after swimming in the sea. I have a rash on butt for a week.