One way to add quotes: use the CHAR()
function together with the correct decimal ASCII code. CHAR(34) should return double quotes. You can insert the CHAR() function directly into a concat statement:
= CHAR(34) & A1 & CHAR(34) & " wash"
should combine the content of A1, nested into double quotes, and append " wash".
To modify the source data itself (in your example: no second column, modify the source column), you could use a search / replace with regular expressions. To do so:
- Select the column containing the data to modify
- select Menu "Edit" -> "Find & Replace..."
- Enter
^(.*)$
as search text (matches the whole cell content) and "$1"
as replace text (returns the complete search match, embedded in quotes):

- Hit Replace or Replace all to execute the search/replace run.