Getting access is not the problem here it is the risk of drowning that is the problem.
I would suggest you to remove your water dish IMMEDIATELY if you do not want to end up with a dead crestie, for a crestie that size use a water bottle cap and put water in it same to provide food (CGD) and when your crestie is big enough move up to something like this http://www.pangeareptile.com/store/i...ry&image_id=60 .
Your gecko will drown if you keep a dish with that much water in it. Your gecko will drown too in the food dish if it is too deep.
Also you can purchase the CGD from most local petstores it comes in bottle with a purple lid, do not feed mealies to such a young crestie, even for adults I would not recommend it.