my son who is 14 mos, is being raised a vegetarian because my husband is an omnivore who refuses to allow veganism for his child... my hubs is not a fan of "extremism" in either direction and feels that our son will be healthy even with a glass of milk and/or a sprinkling of cheese here and there.....i'd rather him be a veggie then omni, so i have to pick my battles and compromise on the dairy issue.....since i'm a SAHM, he eats vegan 95% of the time and is a healthy, active, and bright little man :) that being said, for beverages, we alternate between eden's rice/soy, 100% fruit juice diluted with water, plain water, or (cooled) decaf green tea or peppermint tea.......loves it and looks so cute drinking from a mug like mommy! food-- he eats anything and everything.....quinoa, rice, beans, tofu, and any veg or fruit you put in front of him....he's a foodie. make sure its varied with colors to ensure a range of antioxidants, phytochemicals, minerals, etc and switch it up....cut them into bite size pieces and put them on fun plates with a dip (hummus, etc) and let him dunk.....if its fun and pretty to look at, the kids should eat it.......side note:: i'm a chef, so i make a lot of my son's meals and balance them with a ton of flavorings--- don't be scared of herbs and spices....they'll develop a greater palate...in fact, your step daughter could help you in the kitchen with stirring or pouring cooled items--that will get her excited about her meal....your son is still so impressionable so use this window of opportunity now. he won't know the difference later on. also, don't be fooled for "kids meals" vs "adult meals"......whatever it is that you're eating, let them try. don't assume because they're kids that they won't like it....my guy even likes a green curry! if they see you enjoying it, then chances are they will too.....love to copy and mimic. again, my little man is healthy, strong, and lean.....
sorry about the long post, but had to share my experiences! good luck and happy eating!
Jill