I have not been able to find any definitive instruction from Katadyn about NOT re-packaging the tablets, but chlorine dioxide is highly reactive and I don't think they would be individually packaged in these really sturdy foil pouches if the manufacturer didn't want to keep them isolated from oxygen, moisture, sunlight, etc.

Just my educated guess, but I highly doubt that your re-packaged MP1 tablets will last very long. One of the selling points of MP1 is their effectiveness against Giardia and crypto, but I definitely wouldn't depend on those tablets to kill these tough buggers if that is one of your goals. They may work "okay" on easier to kill stuff, but how long they maintain that level of killing power, who knows?