All of mine sit in booster seats with trays and I keep the chairs far enough apart for the little ones that they can't touch each other or share food. And they all use cups with lids. I have one I am battling with on the food dropping/throwing right now too...she is 2 and should know better, but only started with me a couple of months ago. I have found that for some kids removing the food doesn't work because that is actually what they want since they are done or just don't like it. For these kids, every time they throw something on the floor, I take their hands and hold them behind their head for a minute...I am very gentle and they are not hurt in the slightest, but they hate it. I used this to train the same 2 year old not to take her shoes and hat off and throw them out of the stroller. It worked well...she no longer does it and if she starts to, all I have to do is warn her about the hands and she stops