It is common for Sri Lankans to eat food with their hands. If they encourage you to do so, only use your right hand to hold the food and pass it to your mouth. The left hand is reserved for cleaning or holding the plate you eat from.
--Kevangelo
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Walking into a restroom in Sri Lanka can be a bit confusing for a newcomer. First off, depending on whether you are in a fancy hotel or a hole-in-the-wall restaurant, there might not be any toilet paper.
--Kevangelo
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Unfortunately, you can't drink the water in Sri Lanka as most of the supply is unsafe. It is advised that drink boiled or treated water to avoid any potential gastro bugs.
--Kevangelo