I can't see anything in your set-up or feeding that should have caused sudden death of two of them. Sometimes without a necropsy and microbiology studies available, we just can't find out the cause. Check out the skin for lesions. You might open them up with nail scissors from the belly and look at the organs, check out the mouth, esophagus, stomach, etc. to see if there are any blockages, or other obvious cause.

Distilled water is often used for misting without a problem, and although it has no electrolytes, generally picks them up from the substrate rapidly when used in water features, so this shouldn't be a problem, either. I'm not much help here, I fear.
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Patty
Pahsimeroi, Idaho

Dendrobates: auratus blue, auratus Ancon Hill, tinctorius azureus, leucomelas. Phyllobates: vittatus, terribilis, lugubris. Epipedobates: anthonyi tricolor pasaje. Ranitomeya fantastica, imitator, reticulata. Adelphobates castaneoticus, galactonotus. Oophagia pumilio Bastimentos. (updated systematic nomenclature)

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