You can see a small house with a built-in aquarium for squid and space for other things.
On the picture you can see two of my horses at the entrance and on the wall a corner with three of my wolves. On the right you can easily see the aquarium which is also visible from the outside!
Instructions:It doesn't matter how you build the house, just remember to put a corner in where you put the aquarium.
Tip: It's best to build the aquarium in front and then put a house around it ;)
Now to the inside of the aquarium. In the bottom Glowstone and sandstones inserted. Fill the aquarium with water and now to the squids;
I built mine on a server and out of kindness an admin gave me 3 spawn eggs for a good price so I didn't have it quite as hard.
Survival: If you can not get to spawn eggs then there is only one way, squids go on a leash but they do not follow you, so it is eig. already mandatory that you build it next to a lake! then you have to install 2-3 squids from the lake before and then build a way to the aquarium that the squids swim in there. This is a very annoying and time consuming work, but in my eyes it is worth it.
IMPORTANT: You have to name the squids with name tags, so they don't despawn!