Thanks for the update. I was able to test that ebay-store-bought system "Automatic-Drip-Irrigation-Plant-Kit-Self-Watering-Can-Timer-System-Indoor-Garden", which turns out to be very good and workable.
It easily draws water from a tank for general/practical level/height of tank placed BELOW the level of the plants. 'BELOW' to avoid continued siphoning/draining issue when the pump is switched off.
Watering duration can be set (inclusive) between 1 second, up to 99 seconds. And frequency of watering can be set for daily, or every skipped day, or every 2 skipped days etc.
I think that should meet the needs of most people for trips. Later, I'm just going to put this through some tests .... like 2 week period, and keep doing it - to test reliability.
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