Originally Posted by Oneironaut
I also want to be capable of making up for my teams' possible incomptenece, despite teemo being squishy.
That is the main problem I had early on solo queuing with Teemo, unrealiable teammates. In order to offset that, the following is the build I used for dps Teemo.
Doran's shield + health pot
phage (later upgrade to frozen mallet)
Madred's razor (later upgraded to blood razor)
I upgrade the phage and razor, and purchase the Wit's end depending on how the game is progressing and what I think will benefit me more at that stage. This build gives you around 117 armor, 114 magic resist, and 2861 health. You also have some health regen and descent life steal and yet still hit pretty freaking hard.
If the game drags on beyond that, I'd sell Doran's shield and get a high tier damage item (usually bloodthirster or black cleaver) or a defensive item such as Aegis or Guardian Angel.