Where the zilla might have an advantage is it comes in a spray bottle. You can spray it on the cricket (I'd be tempted to hand feed that cricket right away). They suggest putting 3 drops directly into the reptile's mouth for extreme cases.
I bought liquid calcium for my last cham, Dano, and I use it every now and again for my current cham Echo. I got it from Petco and it is Fluker's liquid calcium, what I do is just put a drop on his mouth and wait for him to lick his lips sometimes I have to get him to puff up to realize it's there but I just follow the instructions on the package. I have had no problem with using it good luck