Designing water systems with natural spring on property

I have a 3000m^2 plot for a family of 4 homestead in Indonesia. First things first, design WATER. There is no municipal grid water, we are in a remote area. A spring/'stream' borders the back end of our rectangle-ish plot. The rectangular plot is mostly flat, until it slopes down in the back of the land to the spring / “stream”.  Some of the slope is rather steep, some is gentle and can easily walk to the spring. On our property, the stream is currently not flowing but it’s still wet. Just a few meters downstream the water is fully flowing, and actually channeled and used by neighbor farmers to irrigate rice paddies. Neighbors say it flows year round. BUT water doesn’t flow up, so alas, to utilise it we will have to pump it.

I don’t think directly pumping water from above ground downstream is reliable, and potentially not clean given the surrounding agricultural runoff and the dirty plastic dumping from local homes everywhere.

Currently I am thinking to drill a well near the spring/’stream’, and I assume I won’t have to drill too deep. I will also calculate how big of a rain tank we can have to collect water off the house roof on the flat land. I am thinking to use the pumped well water mainly for the garden irrigation, and the harvested rain water for the drinking water.

Sumatra is a rainy tropical climate, although it does get dry mostly June-September.

As you can see, the plot is empty, so I am designing for water and will next need to choose a location for the house, and consider access through the property, etc. It is cut off in the picture, but the government road directly borders the end of the property opposite the stream.

Looking for any advice or stand out issues you may notice in my thinking!