What's the water icon function for

If isn’t servicing together with the meal iconIMG_20210916_130642

Empty and fill watertank of plane. Its used for example for toilet

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I think that one is fill and the other one next to it is unfill or something

No, that’s emptying the black tank (or the poop tank) of the plane

Yea I think one was unfill and refill but makes sense and I though catering also adds drinks

I thought*

it’s s water service that provide for drinkable/fresh water ( i.e for making coffee or tea ).
lavatory service just provide water for flushing toilet.
catering can provide a drinkable/fresh water, but only in package (bottle)