What I recommend you add to an EGo-T
1. normal 510 atomizer and 510 drip tip (for testing juices and
vaping thick juices)
2. cartomizers - standard metal cartomizers and the most popular are Boge - I use thin juices, PG w/ 20% or less VG in these to get good reuse out of them. If you learn to use these you will always have a backup way to vape if you have atomizer problems. Also use these for any cinnamon flavors you like (cinnamon can eat plastic). Use for clingy flavors you don't want in your atomizers (like cloves and some others). The Boge 3 ohm are barely warm and easier to learn on. The Boge 2 ohm are hotter and preferred for
vaping on Egos. Then there are all kinds of exotic cartos you can also try, but Boge are inexpensive and work well.
3. A spare charging cable (I actually like to have 3 cables for any model I depend on - one for at work and 2 at home so i can charge both 2 batteries at once and so I have a spare if one cable develops a problem)
4. If you only have one tank atomizer then you need a spare or two. And anytime one dies, order a new spare.
5. Soft cap replacement doors for tanks
https://www.cignot.com/product_p/egt-sil-cpa.htm
https://www.cignot.com/product_p/egt-sil-cpb.htm
6. And I don't use tanks but you may want something to make it easier to get the juice into the tanks. if you search for bottle at Gotvapes.com and go through the 4 pages you'll see pipettes, syringe-top bottle, an some kind of interesting longer dropper tips for bottles.
7. ELiquid and plenty of it because new vapers are the ones who run out of juice. I believe tanks like the thickness of PG w/ 30% or less VG. 100% PG may be more prone to leaking. Some thinner 50/50's may work.
8. Go to Youtube and watch videos about Ego-T function and fixes (like anything about filling, repositioning the wick, cleaning the atomizers, etc) so you will know how to do those things.