Starting my baby on solids and he's not enjoying rice cereal at all. Can I put some in his milk bottle to get him used to the taste?

Sure, you can do that. Some mummies mixed in their milk and give it to then during feedings. Or perhaps, you'd want to try on other types of solids? Personally, I am skipping cereal as I am giving him pureed veggies/fruits instead. Occastionally he gets bits of steamed mashed peas or blueberries for snacks. I'm using the Philip Avents 2in1 steamer which I got from Takashimaya at about $160+. I find it super useful, just chuck my fruits/veggies in and steam them. I get my breakfast settled that way too