If you are ever abroad and don’t have your shrine for offerings and stuff, you can just pour ancestor offerings into the earth, and pray to the gods as you normally would without the shrine or altar. If you’re on vacation you are most likely fine until you return anyway, but when you feel the need to do this stuff that’s an alternative.

If you’re living in the car or away, you can also do the libations on whatever ground is near you. Even the sink can work in cases of no nearby dirt. Don’t worry about having a bunch of statues and shrine objects if you aren’t in a situation to maintain it.