"Cube taps" or "3-way plug adapters," 1 to 3 plug splitters are available in any ferreteria (hardware) shop (tienda), DIY, department store that sells small electronics, or travel supply store in Europe or Spain (as this is the Camino forum). Most all European countries use the same, two-round pin Schuko plug.
If you bring your camera, phone, or tablet charger from home, and that charger is rated at 110-240 volts (VAC) and 50-60 Hz, all you need is a small, inexpensive plug adapter to convert from your home plug pin configuration to the two-round pin Schuko configuration.
Below linked, is the US pin-adapter I use on all my European travels.
http://www.world-import.com/WMU5.htm
The fit into any grounded or ungrounded Euro socket. I buy these things a dozen at a time as they are so cheap. The equality is first-rate. I consume them by giving them away to other travelers (I usually carry two) or losing them. But as you can see, they are very inexpensive here.
On one of my trips to Europe or Spain, I forget right now, I found a cube tap that has two plugs coming in from the 3 o'clock and 9 0'clock positions and one coming straight in from the front. The pins plug into any grounded or non-grounded European outlet using the Schuko configuration. The three shared "outies" are arrayed to maximize the clearance from cube type chargers.
If you find a shop that has several types, I recommend the style that is flattest to the wall, based on my experience. It should be lighter weight and smaller in size.
I found this one on Amazon.com in the US:
http://www.amazon.com/dp/B00K7DYEHA/?tag=casaivar02-20
It will work in any wall outlet, but it may be heavier than the type you can easily find in Europe.
The other type, for a grounded outlet, will NOT fit in the more-present, old style, two-pin non-grounded outlet. Most small electronic in Europe, like in the US have two pin plugs, not three-pin grounded plugs.
However, here are the configurations I find most often across Europe and in Spain:
3-way adapter plug for unearthed 2-pin plugs. This is the lightest weight type I have found...yet...
3-way flat style plug adapter
3-way grounded (2-on the Y) and ungrounded (1-straight in) Schuko plug sharing adapter.
Below linked, is the pin-adapter I use on all my European travels.
http://www.world-import.com/WMU5.htm
I buy these things a dozen at a time as they are so cheap. The equality is first-rate. I consume them by giving them away to other travelers (I usually carry two) or losing them. But as you can see, they are very inexpensive here.
I hope this helps.