The first ‘ships were powered by muscle or the current of the water which our ‘ships’ will also probably be powered by. (Unless we already have enough fabric to make a sail.

I’ll start with a quote from Wikipedia about dugouts (Hollowed out trees) which basically tells us everything we need to know about making one.

Construction of a dugout begins with the selection of a log of suitable dimensions. Sufficient wood needed to be removed to make the vessel relatively light in weight and buoyant, yet still strong enough to support the crew and cargo. Specific types of wood were often preferred based on their strength, durability, and density. The shape of the boat is then fashioned to minimize drag, with sharp ends at the bow and stern.

First the bark is removed from the exterior. Before the appearance of metal tools, dugouts were hollowed-out using controlled fires. The burnt wood was then removed using an adze. Another method using tools is to chop out parallel notches across the interior span of the wood, then split out and remove the wood from between the notches. Once hollowed out, the interior was dressed and smoothed out with a knife or adze.
More primitive designs keep the tree's original dimensions, with a round bottom.

However, it is possible to carefully steam the sides of the hollow log until they are pliable, then bend to create a more flat-bottomed "boat" shape with a wider beam in the centre.
For travel in the rougher waters of the ocean, dugouts can be fitted with outriggers. One or two smaller logs are mounted parallel to the main hull by long poles. In the case of two outriggers, one is mounted on either side of the hull.

Controlled burning; one way to make a dugout.


In the scenario of us spawning in an alpine area the most usefull wood to be used would be either Ceddar or Oak wood since both of these trees grow very large and both trees are very dense and strong, thus being able to withstand the water and carry large amounts of people.

Rafts:
The most basic of ship a raft is constructed by simply chopping down some trees removing the branches and tying them together. Additionaly though a sail could be fitted on a raft to give it increased speed and mobility.

whats pitch

@King Zultra I Sure no problem