There is a style of chicken waterer that is common in the USA. I don't know if it's easy for you to get in Australia or not.
It has a big section full of water, and a shallow trough at the bottom. You fill the big section, and the water trickles into the shallow section as the chickens drink it. Some of them are big and made of metal, hold around 2-8 gallons (about 8-30 liters). Others are small and made of plastic. The smallest I've seen holds about a quart of water (about one liter).
The shallow trough means that chickens can drink but mostly cannot fall in. Young chicks occasionally manage in the very first few days, but are generally fine after that. The large upper part means there is lots of water to refill the little trough as the chickens drink it or as it evaporates.
Examples of the big metal kind. You lift off the top to fill it, then put the top back. That pushes a little lever to open a small hole, so water can trickle out into the trough as the chickens drink.
https://www.tractorsupply.com/tsc/product/harris-farms-5-gal-double-wall-drinker
https://www.mcmurrayhatchery.com/large_galvanized_waterers.html
https://www.amazon.com/Harris-Farms-Galvanized-Poultry-Drinker/dp/B006ZJHBPM
Examples of the smaller plastic kind. You fill the white part, screw on the red part, then turn the whole thing over so it's ready to use. (Other colors exist, but white with a red base is very common.)
https://www.tractorsupply.com/tsc/product/harris-farms-poultry-drinker-5-qt-2167654
https://www.mcmurrayhatchery.com/quart_fruit_jar_base.html
https://www.amazon.com/Little-Family-Members-Drinker-Automatic/dp/B0CTD1QYF3?
I put in several links for each kind, in hopes that at least some of them will work for you to see what I'm talking about. (And if someone is reading this thread a few years in the future, hopefully some will still work.)