Hi from Indonesia

Hello,
I'm Brian from Indonesia.

There was a cat playing in my house and it seemed to be a stray cat so I tried to give him some food and drink. While I use a reverse osmosis water filter at home to kill viruses and bacteria, is it safe to give the water to the cat? 

Hi Brian,
Welcome to the forum! 

It is safe to give RO water to pets on occasions.   The general rule is, if the water is safe for you, it should be safe for pets.  
However, RO water lack of minerals.  So it is not so healthy to drink it for long-term.  It can "wash" away the minerals and vitamins consumed by the pets.  

It is so nice of you to provide food and water to strayed cats.   Did it keep coming back for more?

Hello!

Good to see you here. What kind of pets do people like to have in Indonesia? I think they are many ponds and lakes in Indonesia.

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Hello! Yes it's safe, but not often.