As it is right now, there's no real point to actually clicking to collect the water/compost that builds up unless you actually need it. When the total amount of water/compost available (both claimed and unclaimed) hits the max limit, it stops producing more - even if you've claimed it all.
So, I propose one of two changes:
1. Get rid of having to claim the compost/water. Let it accumulate automatically, like stamina, until it hits the max.
2. Even if you already have the maximum amount of water/compost collected, let an additional reserve of some form build up over time that you can only claim after you use some of the compost/water you already have.