I personally wouldn't use pond water....and I understand about the drought...laffs.....I would just use the source water that you normally use....
Small containers-the containers that some Bettas are bought in work well-but half-1gal will work fine too.....with hard spawners/breeders-sometimes if you make the conditions somewhat cramped, not as great water quality, cooler water.....once they get placed in the larger space, improved warmer water.....they think (my theory) the rainy season hit and its time to spawn/reproduce...some could care less....but with reluctant breeders I have found this to work 80% of the time and 20% may never spawn no matter what you do and I feel this is either age, genetic, unseen health reasons...etc.......