u can get distilled water from petronas la .
i bought 5 litre for RM7 .
u see d table of nutrient , its all 0 . so its distilled ^^,
somtimes they juz print out as drinking water so u check d nutrient .

feser coolant i heard after long usage could lead to "pemendapan" donno wat its called in english
ask dro for d link .
he told me bout it ^^,
well , i'd say distilled water should be good enuf for WC ^^,

juz to be safe , try google around and see if there's any bad thing bout those coolant we're using .

haha correct2 . based on user preference la .
doesnt matter anyway .