“Drop acid, not bombs” is an anti-war saying that has been printed on many images.
 
“Drop Acid Not Bombs” was printed in the Fresno (CA) Bee on July 16, 1967. “Drop acid, not bombs” was printed in the Alamogordo (NM) Daily News on October 22, 1967. “Drop acid, not bombs” was printed in the Tucson (AZ) Daily Citizen on November 2, 1968. It’s not known who originated the saying.
   
“Drop taxes, not bombs” is a related saying.
     
 
Newspapers.com
16 July 1967, Fresno (CA) Bee, “Through a Glass Lightly” by Eli Setencich, pg. 1-B, col. 1:
The threatening and the dove-like: Revolution is Coming and Blessed are the Peacemakers, The Marine Corps Builds hate and Drop Acid Not Bombs.
       
Newspapers.com
22 October 1967, Alamogordo (NM) Daily News, “Former Staffer Reports Scene In Capital,” pg. 6, col. 4:
Some of the banners and posters carried by the crowd were interesting, Among those glimpsed were “Drop acid, not bombs”, “hell no, we won’t go”, “We won’t fight Wall Street’s war”, and one that read “1868-1968 Dump Johnson Centennial.”
 
Newspapers.com
2 November 1968, Tucson (AZ) Daily Citizen, “The Handwriting on the Wall” by David Carter, Magazine sec., pg. 6, col. 5:
...“Drop acid, not bombs,”...
 
Google Books
The Function of Folklore in the Hippie Community
By Deborah Goleman Wolf
Thesis; University of California at Berkeley
1969
Pg. 102
( 5 ) ” Make Love Not War ” Variants
a) Make Love Not War, b) Lay Don’t Slay, c) Kiss Don’t Kill, d) Drop Acid Not Bombs, e) Draft Beer Not Students, f) Save Lives Not Face, g) Tao Not Dow. 
 
Newspapers.com
19 October 1969, Roanoke (VA) Times, “West Wind Blows Cold” by Ben Beagle, pg. B-1, col. 1:
Certainly the Vietnam moratorium is a slippery thing intellectually—with young girls in long shining hair plunking guitars and singing sad songs; chanting in a candlelight parade, “Drop Acid, NOT Bombs.”
 
Newspapers.com
22 February 1970, Atlanta (GA) Journal and Constitution, “Protest of War Greets Agnew Here” by David Massey, pg. 3-A, col. 1:
Some signs were merely derisively humorous: “Mickey Mouse wears a Spiro Agnew watch,” “Pray for Nixon’s Health,” “Drop Acid, Not Bombs.”
 
Google Books
Broadcasting
Volume 79
1970 ·
Pg. 42:
...a looseleaf notebook, which among other “in” phrases on its cover, suggested: “Drop acid…not bombs.”
         
Twitter
skiz
@skiz
drop acid not bombs!
9:05 PM · Jul 31, 2008
 
Twitter
Morlan Ghor
@MorlanGhor
Drop Acid Not Bombs Hooded Unisex Sweatshirt http://amzn.to/2eozdvW
3:26 PM · Nov 2, 2016
 
Twitter   
Marion Love
@6tQ0FhhevRWUJjp
Drop Acid Not Bombs Design Kids Unisex T-shirt 5-13 Ages http://amzn.to/2nc4lTZ
10:38 PM · Mar 19, 2017
 
Twitter
Hesed
@Hesed_M
Drop Acid, Not Bombs!
(This is also shown on an image.—ed.)
2:40 PM · Mar 31, 2017
 
Twitter
Nella
@Antonellaguayo3
Drop acid not bombs 👽
(This is also shown on an image.—ed.)
12:30 PM · Apr 18, 2017
 
Google Books
Drop Acid Not Bombs
Great Lined Journal to Write Down Your Thoughts
By Bolt · 2019
 
Twitter     
Gate 14 Clobber
@gate14clobber
Stock room find: Drop Acid Not Bombs grey size XL. £15 in the sample sale ✊🏼
https://gate14clobber.co.uk/product/drop-acid-not-bombs-tee-light-grey-sample
(The saying is shown on a T-shirt.—ed.)
2:29 PM · Apr 20, 2021
 
Twitter
kerry
@boyfromdixie
Drop Acid Not Bombs
(“DROP ACID NOT BOMBS!!!” is shown on a protest sign.—ed.)
6:45 PM · Aug 28, 2022
 
Twitter
sweet daddy luv
@djluvsrecords
Drop Acid Not Bombs, before #303day is done.
http://djluvsrecords.com/2016/03/luv303/
(The saying is also shown on an image.—ed.)
10:15 PM · Mar 3, 2023
 
Twitter
RedRuby DaSleeze❤️‍🔥
@Ladyxmurrx
“DROP ACID, NOT BOMBS”
8:42 PM · Apr 3, 2023