My loom has metal strips with slots on both beams.
I also use matchstick reeds on my looms.
I first thread a warp pair through the reed then tie a knot and slip it into the first slot, and so on( A ).
I ½ turns of the cloth beam secures the warp. I use paper as warp layer separator.

This warp is 4m (12' ) long, and all went very well, beautiful even tension!

Then I positioned the bottles and divided the warp in equal bundles, 2 to a bottle.

Then I tied the bundles with a slip knot around the handle of each bottle.

Then slowly wound up the weighted warp,- repeat from B !
I use paper to separate the warp layers.

When the warp ends reach the cloth beam I slip warp pairs into the slots as shown on this photo.
1 ½ turns of the cloth beam will secure the warp ends. Again I use paper to separate layers. Then the loom is ready to start weaving!