I’ve searched around and mostly seen people create custom radiator builds attached to their water supply, but that’s beyond my skill level and I’m not sure if linking it directly to the water supply via piping would violate the lease or not. Are there any solutions a bit more DIY that I could take advantage of?
A swamp cooler would potentially be a solution; those could be used in conjunction with your ready access to water in order to keep your home cool! Sadly, this is not great for areas of the world which already have high levels of humidity in the air. I don’t know if it would work well for you based on not knowing your climate. https://en.wikipedia.org/wiki/Evaporative_cooler
Swamp coolers only really work if humidity is low. If it’s already humid then any drop in temperature is negated by the increased humidity.
Honestly I get the most “cooling” by putting a dehumidifier in front of my fan. Dry air will feel a lot cooler than super humid air.