When DD was 4 months or so I desperately wanted to started on solids, but I read up on it and agonized about it and didn't. It was a terribly hard decision for about a week, and then it wasn't any more. I don't know why. We gave her ice, and she learned to use a sippy cup of water. It wasn't really an issue.
At 6 months, it didn't seem like too late or anything. It still took a week for her to get even kind of into the swing of things, and 3 weeks in she's waking more often, if anything. Then again she doesn't eat all that much; today was as usual more than ever before, which amounted to maybe a teaspoon or two of cereal (bits she can eat as finger food, not mush), a small plum, a tablespoon of carrots, and a teaspoon of chicken-apricot-lentil stuff. It's not like I could get a jar of babyfood or a couple of tablespoons of baby rice into her without force majeure.