Gel Cookers

[Bug_out_Bag]

Does anyone know if the gel in these Swiss Army cookers can be purchased somewhere please? It worked brilliantly this weekend but was a bit short lived for my liking. I think there was a discussion on here sometime ago about refilling them with something else ... I've looked for that thread but can't find it!

Anyone got any idea what I could refill it with please?

Thanks in advance