我忘了去拿我的水瓶

有时（我）（去）工作的时候（我）会忘了去拿我的水瓶，所以我会在去超市买一瓶新的水瓶。我发现（I add this "S+V" can make the last sentence and the next to interlink better with logic），现在超市里有很多圣诞节的东西玩意儿，不过它们真的是太贵啦！

→→→  有时工作的时候会忘了去拿水瓶，所以我会去超市买一瓶新的。我发现，现在超市里有很多圣诞节的玩意儿，不过它们真的是太贵啦！

comment:

Du bist einfach süß!  haha

I remember that I have told you "in the time of.... (的时候)" should not be omitted in Chinese. But in English what you express like that is definitely ok~ Hope that you can not "vergessen" again while writing an article!   ヽ(•̀ω•́ )ゝ

I find that one point you did very well: To put prepositional phrase of place adverbial(地点状语之介词短语) after subject, not in the end of a sentence.   Well done! Because this idiomatic expression（习惯表达） just oppsite to the one in English~

I suggest you to upload the English version of your Chinese article. It will make us understand what you want to say better.

Du bist ein fleißig Mensch. Ich bin sehr glücklich, wenn ich dir helfen können!

我忘了拿我的水瓶壺<礦泉水>