Never heard of adding water or milk. I wouldn't recommend it especially the milk. Seems like liquid would result in dubia deaths. I know it would with crickets.
Not a good idea. Tomato's have a high vitamin a count. Can be toxic to cham's. Try bell peppers, zuchinni, squash, sweet potato, carrots, collard, kale and mustard greens.
Try a search on gutloading.
I would definitely make sure he is under some sort of shade. You wont need uvb, your cham will get plenty uvb exposure as long as he is outside. You will be fine as long as the cham has shade and water.
5 hours of direct sunlight on a jackson could easily overheat the cham. You would need to be watering every hour for 2-3 min at least.
I had a juvenile panther in the hot Florida weather during the summer and he did really well. The temps were near identical to Ambilobe. I only had my cham...
Just out of curiosity it seems like you were expecting these babies. Why would you not do any research before these babies hatched?
What kind of uvb do you have? Is it a coil or linear style bulb?
5-6 is a little much. Waxies are little globs of fat and offer little nutritional value. I would feed no more than 2-3 a week for a juvi. Silkworms are a much better choice as they have much more nutritional value than supers, horns and waxies.
Variety is key so try and mix it up everyday...
Silkworms are a common staple and are much better than hornworms and superworms.
Nobody should really have a staple. You should try and mix it up as much as possible.
Pet stores give out incorrect information, it really sucks. Make sure you angle the shower head so it sprays off the side of the wall or shower door. Direct contact could hurt the eye
She looks dehydrated from those pics. That powersun was probably cooking her. I would be misting 4 times a day for 2-3 min and maybe a 10 min shower is necessary (while shes on a plant of course). Did you remove the powersun?