I just came across some of the "contracted forms" used in conversations, which
I'm not really familiar with. May you help me decoding the ones that I found
impossible to understand and to translate them into the more "common" form?

I will explain it better, for example in this sentence: "あしたいちんち、どっか出掛けよっか。",
I do understand that どっか is どこか and that 出掛けよっか is 出掛けようか, but I cannot figure
out what いちんち means.

I also found: "何すんの", which I believe corresponds to "何するの", but I'm not
really sure about it.

The last one that I cannot understand is 買ってこよっか, as in: "何か飲むもんでも、買ってこよっか".

Thank you in advance.
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colloquial-language contractions
Problem with some 縮約形
すんの and ～よっか are extremely common casual contractions of するの and ～ようか.

いちんち, on the other hand, I've never seen before, and to me it looks more like
a typo than anything at first glance. Where did you see this? From the
context, I would guess it's a contraction of 一日 (いちにち), but I don't think it's
a particularly common one.

A little searching suggests that this may actually be a [dialectal
word](https://www.weblio.jp/content/%E3%81%84%E3%81%A1%E3%82%93%E3%81%A1),
clearly deriving from 一日 but with slightly different usages depending on the
source region.
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> あしたいちんち >>> 明日一日 【あしたいちにち】
>
> どっか >>> どこか
>
> 出掛けよっか >>> 出掛けようか 【でかけようか】
>
> 何すんの >>> 何するの 【なにするの】
>
> 飲むもんでも >>> 飲【の】む物【もの】でも
>
> 買ってこよっか >>> 買【か】ってこようか

The first one いちんち is somewhat rare but there are other words like it which
can have similar contractions when certain vowel+consonant combinations occur.

For example おれのうち becoming おれんち.
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answer