Water.
Not clean or pure or fresh water, but ALL water.
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A perpetual calendar is the type of calendar that can be adjusted for any year. This type of calendar can be reused each year.
In this case, you would use the word 'more' in front of 'perpetual' to indicate the comparative form.
meh
eternal unceasing never-ending endless
endless - unending - infinite - never-ending - perpetual