I have Aphrodite and Nike SSR. I have around 9000 jewels. Can I use them anytime or should I wait until the next water event (Water) Osiris. Does it being a water event raise water chances in addition to the featured SSR or is just the featured SSR higher chance (e.g. 20%) and every other SSR equal?

Is there a water SSR I should save for since Snow Raph and Cthulu were featured months ago.