A regular pentagon is constructed externally on each side of a regular pentagon of side $1$. The figure is then folded and the two edges of the external pentagons meeting at each vertex of the original pentagon are glued together. Find the volume of water that can be poured into the obtained container.
1. **Determine the coordinates of the vertices:**
   - We start by placing the original pentagon in a coordinate system. Let one vertex be at the origin \((0, 0, 0)\).
   - The coordinates of the adjacent vertices can be determined using the angles of a regular pentagon. For simplicity, we place the vertices at:
     \[
     (1, 0, 0), \left(\cos 72^\circ, \sin 72^\circ, 0\right), \left(\cos 144^\circ, \sin 144^\circ, 0\right), \left(\cos 216^\circ, \sin 216^\circ, 0\right), \left(\cos 288^\circ, \sin 288^\circ, 0\right)
     \]

2. **Determine the coordinates of the vertices of the external pentagons:**
   - Each external pentagon is constructed on the side of the original pentagon. The vertices of these external pentagons will be in the plane perpendicular to the side of the original pentagon.
   - For example, if we consider the side between \((1, 0, 0)\) and \((\cos 72^\circ, \sin 72^\circ, 0)\), the vertices of the external pentagon will be in the plane perpendicular to this side.

3. **Calculate the height of the prismatoid:**
   - The height of the prismatoid is the vertical component of one of the glued edges. This can be found by considering the vertical distance between the original pentagon and the external pentagons.
   - Let’s denote the height as \(h\). The height can be calculated using the coordinates of the vertices of the external pentagons. For simplicity, we can use trigonometric identities to find the height.

4. **Calculate the areas of the bases:**
   - The area of the lower base (original pentagon) is given by:
     \[
     A_{\text{lower}} = \frac{5}{4} \cot 36^\circ
     \]
   - The area of the upper base (external pentagon) is given by:
     \[
     A_{\text{upper}} = \frac{5}{4} \cot 36^\circ (1 + y \sin 36^\circ)^2
     \]
     where \(y\) is the vertical component of the external pentagon.

5. **Calculate the volume of the prismatoid:**
   - The volume \(V\) of the prismatoid is given by the formula:
     \[
     V = \frac{h}{2} (A_{\text{lower}} + A_{\text{upper}})
     \]
   - Substituting the values of \(A_{\text{lower}}\) and \(A_{\text{upper}}\), we get:
     \[
     V = \frac{h}{2} \left( \frac{5}{4} \cot 36^\circ + \frac{5}{4} \cot 36^\circ (1 + y \sin 36^\circ)^2 \right)
     \]
   - Simplifying further, we get:
     \[
     V = \frac{5h}{8} \cot 36^\circ (1 + (1 + y \sin 36^\circ)^2)
     \]

6. **Final expression for the volume:**
   - The final expression for the volume of the container is:
     \[
     V = \frac{5h}{8} \cot 36^\circ (1 + \cos 108^\circ \tan 36^\circ)^2
     \]

The final answer is \(\boxed{\frac{5h}{8} \cot 36^\circ (1 + \cos 108^\circ \tan 36^\circ)^2}\)