How to cure extreme dry mouth/mouth blisters?

My nana has ms and is in the final stages and is not doing very well and she is completely mentally competent and knows what’s going on and is b

My nana has ms and is in the final stages and is not doing very well and she is completely mentally competent and knows what’s going on and is bed ridden and can’t swallow and rn her mouth is so dry it’s cracking and blistering over but she can’t spit or swallow how could we help her she is in so much pain

or:My nana has ms and is in the final stages and is not doing very well and she is completely mentally competent and knows what\u2019s going on and is bed ridden and can\u2019t swallow and rn her mouth is so dry it\u2019s cracking and blistering over but she can\u2019t spit or swallow how could we help her she is in so much pain

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