Water to drink

We aren't sure what the situation is with the tap water here but people generally don't drink it so we don't either. One place we lived had a filter on the tap but mostly we use refillable 20 liter bottles. Sometimes, like now, we live far from the road and getting the water to the house can be a hassle. To address the issue, I brought a backpacking filter back from the US and enjoyed mindlessly pumping our water 10 minutes every day until a plastic piece broke off and ended that. Today, I stopped to get our 20 liter bottle refilled and the lady told me the bottle was too old and she wouldn't take it. That was strange because no one ever looked for a date before but there was nothing I could do so I headed to a self-service place nearby. The machine wouldn't take my 50 cent coins so I went to a store to exchange my change. The guy told me they didn't have enough change to change my change and I was out of options. I got five gallons for now and will drive to town tomorrow to try and fill the 20 liter bottle. I'm also going find out why it is that we don't just drink the tap water.