die Brause
soda
A carbonated, usually sweet soft drink; a lemonade or soda.
An heißen Tagen trinke ich am liebsten eine kalte Orangenbrause.
On hot days, I like to drink a cold orange soda best.

soda / sherbet / showerhead
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soda
A carbonated, usually sweet soft drink; a lemonade or soda.
An heißen Tagen trinke ich am liebsten eine kalte Orangenbrause.
On hot days, I like to drink a cold orange soda best.

All meanings of 'Brause' are connected with the verb 'brausen' (to roar, rush, or fizz), which describes a fizzing or rushing sound. It connects the fizzing of soda, the powder, and the rushing of water from the showerhead.
Das Wasser braust aus dem Duschkopf.
The water rushes out of the showerhead.
The context makes clear which meaning is intended. Words like 'trinken' (to drink) or 'Flasche' (bottle) point to the soda, 'Pulver' (powder) or 'Tüte' (packet) to the candy, and 'Dusche' (shower) or 'Bad' (bathroom) to the showerhead.
Gib mir bitte eine Flasche von der roten Brause.
Please give me a bottle of the red soda.
The term 'Brause' for soda or lemonade is especially common in parts of northern and eastern Germany.
Im Kiosk gab es verschiedene Sorten Brause zu kaufen.
The kiosk had different kinds of soda for sale.
In connection with the showerhead, there is the fixed expression 'unter die Brause springen' (to jump into the shower), which means to go take a quick shower. In addition, you often have to 'entkalken' (descale) or 'reinigen' (clean) a showerhead.
Nach dem Sport springe ich schnell unter die Brause.
After exercising, I quickly jump into the shower.
shower
'die Dusche' and 'die Brause' can both be connected to showering in the bathroom. 'Die Dusche' usually means the whole fixture or the place where you shower. 'Die Brause' more specifically means the showerhead that the water comes out of. Learners may confuse the words because in everyday life you use the 'Brause' while standing in the 'Dusche'. If you are talking about the whole bathroom fixture, 'Dusche' fits. If you only mean the part that sprays water, 'Brause' is more precise.

Die Brause ist verkalkt, deshalb kommt nur wenig Wasser heraus.
The showerhead is calcified, so only a little water is coming out.
Nach dem Sport ist die Dusche im Bad leider besetzt.
After sports, the shower in the bathroom is unfortunately occupied.