Some coffee makers have a water window on the front. It’s just a tube showing the water level. Don’t pour water into that window—that’s just a gauge. The actual water goes into the tank behind it. Yes, I’ve seen people try. It ends poorly.
Also, if your machine has a “Clean” or “Descale” cycle, don’t use it for brewing. That setting usually runs a vinegar or cleaning solution through the system. You don’t want vinegar coffee. Trust me, it’s a lesson you only learn once.
So, to wrap this up like a warm coffee cozy: find the reservoir, fill it with cold, fresh water to the right line, and never put water in the filter basket. You’re now a coffee maker expert. Go forth and brew.
And if you still mess it up? Just blame the machine. We’ll back you up. Cheers, friend.