There is water every day.

No idiom contains both water and sky.

Water-bearing idioms: meet by chance, adjust the tune, fall out of the water, the last stop, such as a duck to water, water and sky are the same color, beautiful scenery, fish in troubled waters, dew couples, wading through mountains and rivers, splashing water in front of horses, peach blossoms and so on. Japanese idioms include: auspicious day, counting the day, passing the day like a year, fighting for money every day, day after day, the sun and the moon flying like a shuttle, Bai Hongguan, Yao Tianshun, broad daylight, day and night, one day, sunset in the western hills, etc.