I've done several months-long tours. I use Chain-L, a thick wet lube good for 500 to 1 000 kms between applications, rain or shine. I also carry another chain (Wippermann Sx10) and rotate them once per week (typically on Sundays -- I'll lube and rotate). I use ConneX quick links, which do not require tools, other than some patience if the chain is really dirty. I have occasionally cleaned chains in a solvent (gasoline or brake cleaning fluid) but I no longer see value in this.
Have fun