I was recently asked if 'one should give liberations to the 12 daily? Or can you rotate depending on the calendar?'. They explained reading on the Theoi pantheon page that 'These twelve gods demanded worship from all their subjects. Those who failed to honour any one of the Twelve with due sacrifice and libation were duly punished.', and now they were slightly worried.

Within Hellenismos, the Gods rule supreme. We are here to serve and honour Them, and in return, They provide us with what we need to survive. This practice of kharis is one of the pillars of Hellenismos. Not complying with the will of the Gods is called hubris. Hubris, in dictionary terms, means excessive pride or arrogance and comes from the Greek (hýbris, ὕβρις). For me, hubris is not an adjective but a verb. It describes the act of wilful or ignorant refusal to comply by the will of the Gods.

Human kind is said to be a step above animals because we have the ability to think about our actions and predict their consequences, but we are below the Gods, because we are mortal. Unlike the Gods, we do not plan centuries ahead; we have only a limited amount of time to live, and our actions reflect that. We are encouraged to use our ability to think logically about our actions and choose wisely.
I have read on some Hellenic websites that the Gods do not intent to harm us in any way. They wish to help us better our lives and would never punish us.

I think there is overwhelming evidence of the contrary in ancient Hellenic practices, in mythology and in modern day UPG. Odysseus spent twenty years simply trying to get home because he had pissed off the Gods with his hubris; hubris killed many mythological people, amongst which all fourteen of Niobe's children, Tántalos, and even Íkaros, who flew too high towards the sun; many festivals included elements of appeasement; and building only on my own UPG experiences, I have definitely been told to remedy a situation in which I was displaying unintentional hubris, or else. Saying that the Gods will never (or always) do something is a clear example of hubris, to

That said, the Gods do wish the best for us. As long as we honour them as we should, they will provide for us abundantly. Does this mean you have to give honours to all the Gods every day--because there are many more Gods than the twelve (or thirteen, depending if you count Dionysos)Olympians? No, I don't thank so.

Literary and artistic evidence from ancient Hellas shows that daily worship centred around the oikos, the household. The courtyard of the home often held a bômos, a free standing, raised, altar where the majority of household worship took place. Some houses also had a wall niche, an indoor worship area, either in a room especially designated for worship, or in the main family room. These altars were used to worship the Ephestioi (Εφεστιοι), the most personal of the household Theoi. These almost always included: Hestia, Zeus Ephestios (Overseer of the Hearth), Zeus Kthesios, and Agathós Daímōn. Worship of these deities was highly personal, and many other Theoi could be added to this worship list. There was no definite list everyone had to follow. The only list there was, was the festival calendar, and through that, most of the 'major' Gods were worshipped throughout the year.

In my opinion, offering a libation to the Gods on their special days is enough to appease Them; what matters is that They are at the forefront of your mind, and that you speak of them with pride and respect. The Theoi need to be a part of your life--an important part. Think of Them whenever you act, whenever you speak, whenever you think, and you will honour Them simply by being a good human being. Ethics is a huge part of Hellenismos, and along with regular active worship, you will built kharis just fine with the Theoi, even if you don't pour libations to the Olympians every day.