You need one big stainless steel pot, the kind restaurants use for refried beans or soups, 5-10 gallon. You want these instead of plastic so that you can boil it. Large kitchen strainers for pond scum, a small aquarium skimmer to follow up once it's in the pot, then you need water purifying chlorine drops to handle bacteria, and If you have gas burners or propane, you can then boil that water. Run small batches of this water through pitcher filters and it should be 100% drinkable, probably better than tap water too.

Double boil it for using with powder mixes or contact lenses

I'd also start IDing what fish and reptiles/amphibians inhabit your pond. Since it's a natural pond and you probably don't need to worry about chemical waste, there's probably good protein living in there

You need one big stainless steel pot, the kind restaurants use for refried beans or soups, 5-10 gallon. You want these instead of plastic so that you can boil it. Large kitchen strainers for pond scum, a small aquarium skimmer to follow up once it's in the pot, then you need water purifying chlorine drops to handle bacteria, and If you have gas burners or propane, you can then boil that water. Run small batches of this water through pitcher filters and it should be 100% drinkable, probably better than tap water too.

Double boil it for using with powder mixes or contact lenses

Manual strainers for pond scum, then you need to import chlorine drops from Mexico to handle bacteria, and then use carbon filters for sediments

If you have gas burners or propane, you can then boil that water and it should be 100% drinkable, probably better than tap water too.

Double boil it for using with powder mixes or contact lenses