How to use self heating food and MRE heating bag?

Warning
1, keep away from Children.
2, keep away from fire during use.
3, keep away from water during storage.
4, do not use hot water.
5, follow the MSDS in case of emergency.
The heating bag is Dangerous goods, UN2813, DG4.3.(Release flammable gas(hydrogen) when meets water).
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[@BedyBARNARD]

That rice probably contains arsenic