Hi, i wouldn't mix the baytril in water - it can put them off drinking the water. if you cant give it to them yourself with the syringe then yes add to baby food. you can get pouches from the supermarket, go for one with vegetables. either a sainsbury's own or ella's kitchens are quite good. i think they are around a £1. they last 3 days i think it is when opened, or you can do what i do which is freeze them in little ice cube trays. so it is not wasted. I tend to mix the baytril with the baby food and add a few oats.
The metacam you could try offering via the syringe or just put the measured amount on a spoon or little dish in the cage. They normally love the taste of that one so it can be easy to get them to take it.
i have a video which explains it all a bit more (although i need to update it as i do things a bit different now)
Giving Medicine To A Hamster: An Easy Way - YouTube
goodluck and i hope your robo feels better soon.