Moon/sun water indoors

Is it mandatory to leave moon/sun water outside? I'm currently gonna be in an apartment for quite some time, and it doesn't have a balcony. Could I just leave it at the window? Would that affect/change it in any way?

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Leaving it at the window is an excellent alternative and won't damage or change the water in any way. Just make sure there's plenty of sun/moonlight, and you're good to go.

As long as the sun/moon light touches the window sill it should still work fine c:

Thanks, dudes. :D