[7624U]

Shelter: having a good 2-3 man tent that is easy to set up is a life saver.
also if you want to stay real dry having some type of large encloser over that tent can be handy.
When its warm out you wont need the smaller tent just the larger encloser like a BBQ tent or bug screen that has a roof nothing fancey,
it will do nicely to keep the bugs off so you can sleep.

If all you have is the small tent because you dont have the larger.
make sure you always leave a window open to get fresh air while its raining. some tents if they get real wet, will form a vapor lock and you could die inside it from Co2 posioning.

Always have some type of ground pad to lay on even if its just cardboard
your loss of body heat will be twice as fast threw contact with the cold ground.

Survival clothing Wool is my choice ( yes its itchy) its not soft like fleece liners.
Man made outdoor clothing has come a long way but Wool as a under garment under your Gortex jacket is still the best for retaining heat while wet. dress in layers and cotton kills most know these simple truths.