I had a lazy kiddo too...Tyler never held his own bottle. I think when some moms say they're giving solids with the bottle, they might mean one right after the other, not necessarily at the same time. What you're doing sounds fine because it's more important for your DS to keep his bottle intake up for now, since formula should be his main source of nutrition for a few more months. For a beginning solids eater, portion sizes vary quite a bit, but 1-2 tsp is the average. It's best to keep an eye on how much formula he's taking and adjust accordingly so he doesn't fill up on solids.
There are lots of different opinions on how to introduce new foods. Some moms like to mix each new food with something familiar, like cereal, and others like to offer new foods on their own. HTH!