Freeze water bottles with either plain water or water with diluted plant food. Once frozen, open the cap and invert the bottle into your houseplants. The ice will melt slowly and drip into the plant and soak the soil rather than pouring through and out the drainholes. Especially rootbound plants often have water that runs right through without saturating the soil, and can be especially messy overflowing the saucer, etc.
Source: I've been doing this forever, not sure where I learned it.
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