When the apostles went out, they had no support but themselves, they could even go weeks, perhaps months and even years without being part of a "support group" and that was the case for MANY of the early Christians.
Sure it wasn't easy, heck the first generation Christians were Jewish converts and still had the synagogues, even if only for a bit, but the gentiles had only themselves.
Jesus KNEW this would happen and he told them and we remins ourselves his words, " Where two or more gather, I am there" and, " I will be with you always, till the end of days".
We can't judge or make the call that a person is ONLY part of the Church of Christ when they are part of a group that belongs to a "building".