So, I start this scenario (pretty much a standard survival one) with 2 standard supply drops with small everything. To secure my water supply, I need a water cooler, which requires plastic. For plastic, I need to build a large refinery, which is 3 meters wide, so I need to build a modular printer at least 3x4x3. So, the materials supplied in the drop is sufficient to build only 2 thirds of that printer, which means I have to find a lot of siliconoxide, aluminum and iron. I set up my drill on a bunch of rocks, and with my two PV panels producing a total of ~800 Wh at noon time, and the drill burning 1.6 kWh, it takes approximately 10 minutes to fill up a barrel of 130 mars rock, which produces enough silox for only 3 glass panels, of which I need about 16, which means around 1 hour sitting and waiting for the drill. And I also need many more edge panels. So, that's another 30 mins or so. That's just to get the large refinery. After I manage to build one, I'll need to harvest atmosphere and process it to get carbon. So, it's taking about 2-3 hours just to be able to get plastic so that I can build a fountain, and after that I need to build a pressurized shelter, which is another couple of hours, so that I can refill my water pouches.

Is that about right? Or is there a quicker way to secure a water supply which I'm overlooking?