Salamalaykum,
Brother u can make full wadu during ur fast and u can use miswake also
Few things which will not BREAK your Fast insha Allah.
1) If one ate or drunk by mistake i.e. without being conscious of his fast.
2) If water gets into ears.
3) To swallow one's saliva.
4) To have an injection, provided its medicine does not directly reach the stomach.
5) To put eyeliner on, or to apply surma or medicine into the eyes.
6)To have a bath or shower.
7)To rub oil into the body or hair.
8)To apply itr or purfume.
9)To vomit unintentionally.
10)To brush the teeth without the use of tooth paste, etc. example using miswaak.
11)To have a wet dream.
THINKS THAT ARE MAKROOH (UNDESIRABLE AND DISCOURAGE WHILE FASTING)
1)To chew things like rubber or plastic items.
2)To use tooth paste or tooth powder for cleaning teeth.
3) To let the water go too far up the nostrils when cleaning the nose.
4)To over gargle the mouth.
5)To quarrel, argue and to use filthy or indecent words.
6)To swear, tell lies, backbite, etc.
7)To complain of thirst and hunger.
FEW THINGS WHICH WILL BREAK THE FAST
1) While gargling, some water accidentlly goes down the throat whilst conscious of his fast.
2) If one swallow pure blood only.
3)If one swallow blood along with sliva. provided that the quentity of blood is more then sliva.
4)If one intentionally vomit a mouthfull.
5)one was to vomit but return it down deliberatly.
6)If one instils oil into ears.
7)If one inhales smoke deliberately of any kind eg. looban,cigarettes etc.
This are few thing to my knowledge rest Allah knows the best if any mistake pls forgive me and correct me for the sake of Allah.
Hope it has given u some idea may Allah help us in making things as according to Allah guided us.Ameen. Brother please remember me in ur duwas.
Jazak Allah.