MRE Water Bottle Exploit

## Testmerges
#12824: 'Bundles Wound Overlay Updates' by fira at commit 6b48f2d5f1
#12537: 'Atlan Station - Groundmap' by oceany-a11y at commit ed9be01957
#12721: 'Assorted Sound Fixes' by fira at commit 8b5bf0b649
#12618: 'Vanguard Passive Shield no longer regenerates when UNCONSCIOUS or INCAPACITATED, FLOORED, updated strain description.' by Venuska1117 at commit 813c96e27b
#12627: 'Tyrargo Rift (2) - Various Alterations' by Steelpoint at commit dbc4496523
#12626: 'Refurbished Combat Information Centre (2) - USS Almayer' by Steelpoint at commit 86a9778d04
#12947: 'Revert "Working multiz tacmap, round two, extra buttons"' by Rain7x at commit ea384007a4
#12996: 'Records alive/dead/infected/revivable players every minute to influxdb' by Watermelon914 at commit 108eb5d526

## Round ID
36033

## Description of the bug
MREs will accept water bottles filled with chems in them

## What's the difference with what should have happened?
More of an exploit than a bug, it seems you can fill up water bottles with drugs and store them in an MRE, thus allowing an MRE pouch to hold 840u of chems.

## How do we reproduce this bug?
1) Take an MRE, empty it of all but water bottles
2) Fill water bottles with chems, e.g. unga
3) Put them back into the MRE

## Attached logs
```
N/A
```

## Additional details
- Author: Katskan
- Admin: SmellyHippie
- Note: None

No source file or test is named. Start by reproducing the MRE and water-bottle interaction described in the issue, then trace the item-handling path that permits chemically filled bottles; done means MRE storage rejects those bottles while ordinary water bottles still work.

Written by the indexing model from the issue text.