How do you stop your Mouth from feeling yuk when running distance?

I have xc soon like in 4 days but when I run distance my mouth goes really yuk like dry and sometimes I get flem its really disgusting and I'm not sick or anything. anyway to stop it and I don't want to run with a water bottle or anything and I usually have a sip before the race starts but half way threw my mouth gets really yuk and I hate it.